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Income Taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
U.S. | $ 13,934 | $ (28,281) | $ 9,235
Interest and penalties recognized | 300 | 200 |
Asset |  |  |
Depreciation and amortization (a) | 0 | 0 |
Expense accruals | 18,421 | 18,827 |
Inventories | 4,568 | 3,071 |
Provision for receivables | 1,109 | 689 |
Operating loss carryforwards | 85,378 | 81,755 |
Foreign tax credit carryforwards | 24,219 | 25,814 |
Capital loss carryforwards | 0 | 9,759 |
Pensions | 38,766 | 40,442 |
Currency adjustments | 462 | 3,796 |
Post-retirement benefits | 411 | 471 |
Stock based compensation | 6,572 | 5,832 |
Other | 0 | 5,477 |
Deferred Tax Liabilities, Other | 769 |  |
Subtotal | 179,906 | 195,933 |
Valuation allowance | (127,074) | (137,450) |
Total deferred income taxes | 52,832 | 58,483 |
Liability |  |  |
Depreciation and amortization (a) | 58,229 | 8,714 |
Deferred revenue | 3,222 | 3,122 |
Deferred financing costs | 566 | 2,226 |
Total deferred income taxes | 62,786 | 14,062 |
Deferred Tax Assets, Net, Classification [Abstract] |  |  |
Deferred income tax assets | 14,288 | 48,551 |
Other liabilities | 24,242 | $ 4,130 |
Sale of Businesses Reduction of Tax Paid, Change in Capital Loss Carryforwards, Foreign Tax Credit Carryforwards, State Net Operating Loss Carryforwards, Foreign Tax Credit Carryforwards | 12,500 |  |
Merger and Liquidation of Foreign Dormant Entities, Valuation Allowance Reduction, Reduction to Deferred Tax Assets | 5,600 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 7,900 |  |
Domestic Tax Authority [Member] |  |  |
Asset |  |  |
Operating loss carryforwards | 6,000 |  |
International operations |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards not subject to expiration | 57,000 |  |
Asset |  |  |
Operating loss carryforwards | 66,500 |  |
Deferred Tax Assets, Net, Classification [Abstract] |  |  |
Operating losses subject to expiration | 9,500 |  |
U.S. state |  |  |
Asset |  |  |
Operating loss carryforwards | 12,900 |  |
U.S. state | Tax Years 2020 Through 2024 [Member] |  |  |
Asset |  |  |
Operating loss carryforwards | 3,300 |  |
U.S. state | Tax Years 2025 Through 2029 [Member] |  |  |
Asset |  |  |
Operating loss carryforwards | 1,900 |  |
U.S. state | Tax Years 2030 Through 2034 |  |  |
Asset |  |  |
Operating loss carryforwards | 3,200 |  |
U.S. state | Tax Years 2035 Through 2039 [Member] |  |  |
Asset |  |  |
Operating loss carryforwards | $ 4,500 |  |

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