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Income Taxes Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2022 | Dec. 30, 2017 | Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent | 55.20% | 58.60% | 59.60% |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 285,784 | $ 249,560 | $ 235,339 |  |  | $ 257,728
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 3,300 |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 49,300 |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business | 3,700 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  |  |  | 25.00% |  |
Deferred Tax Assets, Net of Valuation Allowance | 77,115 | 116,833 |  |  | $ 10,000 |
Undistributed Earnings of Foreign Subsidiaries and Foreign Corporate Joint Ventures [Member] |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 5,200 | $ 4,900 |  |  |  |
Tax Cuts and Jobs Act [Domain] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | $ 30,400 |  |  |  |  |

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