Entity Central Index Key Dividends, dividend requirements and accretion on preferred stocks. Current and noncurrent carrying amount as of the balance sheet date of deferred revenue on extended warranty contracts. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Supplies prepaid items and other. Carrying amount as of the balance sheet date of precious metals used as a catalyst in the chemical manufacturing process to be consumed or sold within one year or the normal operating cycle, if longer. Total supplies, prepaid items and other. Aggregate carrying amount, as of the balance sheet date, of other noncurrent indefinite-lived and finite-lived intangible and noncurrent assets not separately disclosed in the balance sheet not expected to be realized or consumed after one year. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series E Preferred Stock [Member] Series E Preferred Stock [Member] Series F Preferred Stock [Member] Series F Preferred Stock [Member] Series B Preferred Stock [Member] Series B Preferred Stock [Member] Series D Preferred Stock [Member] Series D Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable, net Accounts Receivable Net Current Inventories: Inventory Net [Abstract] Finished goods Inventory Finished Goods Net Of Reserves Work in progress Inventory Work In Process Raw materials Inventory Raw Materials Total inventories Inventory Net Supplies, prepaid items and other: Supplies Prepaid Items And Other [Abstract] Prepaid insurance Prepaid Insurance Precious metals Precious Metals Supplies Supplies Prepaid and refundable income taxes Prepaid Taxes Other Other Prepaid Expense Current Total supplies, prepaid items and other Supplies Prepaid Items And Other Deferred income taxes Deferred Tax Assets Net Current Total current assets Assets Current Property, plant and equipment, net Property Plant And Equipment Net Intangible and other, net Intangibles And Other Assets Net Total assets Assets Less treasury stock at cost. Liabilities and Stockholders' Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Short-term financing Short Term Borrowings Accrued and other liabilities Other Liabilities Current Current portion of long-term debt Long Term Debt And Capital Lease Obligations Current Total current liabilities Liabilities Current Long-term debt, net Long Term Debt And Capital Lease Obligations Noncurrent accrued and other liabilities Other Liabilities Noncurrent Deferred income taxes Deferred Tax Liabilities Noncurrent Commitments and contingencies (Note 8) Commitments And Contingencies Redeemable preferred stocks: Temporary Equity [Abstract] Redeemable preferred stock, value Temporary Equity Carrying Amount Attributable To Parent Stockholders' equity: Stockholders Equity [Abstract] Preferred stock, value Preferred Stock Value Common stock, $.10 par value; 75,000,000 shares authorized, 27,137,599 shares issued (27,131,724 shares at December 31, 2015) Common Stock Value Capital in excess of par value Additional Paid In Capital Retained earnings Retained Earnings Accumulated Deficit Stockholders equity including treasury stock Stockholders Equity Before Treasury Stock Less treasury stock, at cost: Less Treasury Stock At Cost [Abstract] Common stock, 3,283,081 shares (3,735,503 shares at December 31, 2015) Treasury Stock Value Total stockholders' equity Stockholders Equity Total Liabilities and Stockholders' equity Liabilities And Stockholders Equity Temporary equity dividend rate percentage. Cumulative redeemable preferred stock, dividend rate Temporary Equity Dividend Rate Percentage Redeemable preferred stock, par value Temporary Equity Par Or Stated Value Per Share Redeemable preferred stock, shares issued Temporary Equity Shares Issued Redeemable preferred stock, shares outstanding Temporary Equity Shares Outstanding Redeemable preferred stock, liquidation preference Temporary Equity Liquidation Preference Convertible preferred stock dividend rate Preferred Stock Dividend Rate Percentage Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Series B cumulative, convertible preferred stock, par value Preferred Stock Par Or Stated Value Per Share Series D cumulative, convertible Class C preferred stock, par value Preferred Stock No Par Value Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Treasury stock, common shares Treasury Stock Shares Income Statement [Abstract] Net sales Sales Revenue Net Cost of sales Cost Of Revenue Gross profit Gross Profit Selling, general and administrative expense Selling General And Administrative Expense Other expense (income), net Other Operating Income Expense Net Operating income (loss) Operating Income Loss Interest expense, net Interest Expense Non-operating other expense (income), net Other Nonoperating Income Expense Income (loss) from continuing operations before provision (benefit) for income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision (benefit) for income taxes Income Tax Expense Benefit Income (loss) from continuing operations Income Loss From Continuing Operations Net loss from discontinued operations Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity Net income (loss) Net Income Loss Dividends on convertible preferred stocks Dividends Preferred Stock Cash Dividend on Series E redeemable preferred stock Temporary Equity Accretion Of Dividends Accretion of Series E redeemable preferred stock Temporary Equity Accretion To Redemption Value Adjustment Net income (loss) attributable to common stockholders Net Income Loss Available To Common Stockholders Basic Income (loss) per common share: Earnings Per Share [Abstract] Basic and diluted: Earnings Per Share Basic And Diluted [Abstract] Income (loss) from continuing operations Income Loss From Continuing Operations Per Basic And Diluted Share Net loss from discontinued operations Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic And Diluted Share Net income (loss) Earnings Per Share Basic And Diluted Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Shares [Member] Common Stock [Member] Non-Redeemable Preferred Stock [Member] Nonredeemable Preferred Stock [Member] Capital in Excess of Par Value [Member] Additional Paid In Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Treasury Stock-Common [Member] Treasury Stock [Member] Balance Balance shares Shares Issued Net loss Dividend accrued on redeemable preferred stock Accretion of redeemable preferred stock Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Exercise of stock options Stock Issued During Period Value Stock Options Exercised Exercise of stock options, shares Stock Issued During Period Shares Stock Options Exercised Restricted stock granted from treasury stock Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures Excess income tax detriment associated with stock-based compensation Adjustments To Additional Paid In Capital Income Tax Deficiency From Share Based Compensation Balance Balance shares Payments of preferred stocks and warrants issuance costs. Statement Of Cash Flows [Abstract] Cash flows from continuing operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Net income (loss) Adjustments to reconcile net income (loss) to net cash provided by continuing operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Deferred income taxes Deferred Income Tax Expense Benefit Depreciation, depletion and amortization of property, plant and equipment Depreciation Other Other Noncash Income Expense Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations): Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Inventories Increase Decrease In Inventories Prepaid insurance Increase Decrease In Prepaid Insurance Prepaid and accrued income taxes Increase Decrease In Accrued Income Taxes Payable Other supplies, prepaid items and other Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued interest Increase Decrease In Interest Payable Net Customer deposits Increase Decrease In Customer Deposits Other current and noncurrent liabilities Increase Decrease In Other Operating Liabilities Net cash provided by continuing operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Cash flows from continuing investing activities Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Expenditures for property, plant and equipment Payments To Acquire Property Plant And Equipment Purchases of short-term investments Payments To Acquire Short Term Investments Proceeds from noncurrent restricted cash and cash equivalents Decrease In Restricted Cash Other investing activities Payments For Proceeds From Other Investing Activities Net cash used by continuing investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Cash flows from continuing financing activities Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from revolving debt facility Proceeds From Lines Of Credit Payments on revolving debt facility Repayments Of Lines Of Credit Proceeds from other long-term debt, net of fees Proceeds From Issuance Of Other Long Term Debt Payments on other long-term debt Repayments Of Other Long Term Debt Payments of debt issuance costs Payments Of Debt Issuance Costs Payments of issuance costs relating to preferred stocks and warrants Payments Of Preferred Stocks And Warrants Issuance Costs Payments on short-term financing Repayments Of Short Term Debt Proceeds from exercises of stock options Proceeds From Stock Options Exercised Excess income tax benefit associated with stock-based compensation Excess Tax Benefit From Share Based Compensation Financing Activities Dividends paid on convertible preferred stocks Payments Of Dividends Preferred Stock And Preference Stock Net cash provided (used) by continuing financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Cash flows of discontinued operations: Net Cash Provided By Used In Discontinued Operations [Abstract] Operating cash flows Cash Provided By Used In Operating Activities Discontinued Operations Net decrease in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Income (loss) per Common Share Earnings Per Share [Text Block] Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Other Liabilities Disclosure [Abstract] Current and Noncurrent Accrued and Other Liabilities Other Liabilities Disclosure [Text Block] Guarantees [Abstract] Accrued Warranty Costs Product Warranty Disclosure [Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Long Term Debt [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivatives, Hedges, Financial Instruments and Carbon Credits Derivative Instruments And Hedging Activities Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Securities financing including redeemable preferred stocks. Equity [Abstract] Securities Financing Including Redeemable Preferred Stocks Securities Financing Including Redeemable Preferred Stocks [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Information Cash Flow Supplemental Disclosures [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Consolidation Consolidation Policy [Text Block] Use of Estimates Use Of Estimates Concentration of Credit Risks for Cash and Cash Equivalents Concentration Risk Credit Risk Redeemable Preferred Stocks Stockholders Equity Note Redeemable Preferred Stock Issue Policy Equity Awards Share Based Compensation Option And Incentive Plans Policy Income (Loss) per Common Share Earnings Per Share Policy [Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Previously Reported Correction and Reclassification Prior Period Reclassification Adjustment Description Schedule of Previously Reported Correction and Reclassification Schedule Of Error Corrections And Prior Period Adjustments [Text Block] Computation of Basic and Diluted Net Income (Loss) Per Common Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block]