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Income Taxes (Statutory Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statutory rate reconciliation |  |  |
Tax provision computed at U.S. statutory rate | $ 11,650 | $ 7,228 | $ (3,156)
Foreign taxes not offset in U.S. by foreign tax credits | 24,840 | 6,775 | 6,319
Impact of Tax Reform Act |  | 52,449 |
Recognition of foreign deferred tax assets, net of U.S. impact | (45,751) |  |
Unrealizable foreign deferred tax assets | 24,176 |  |
Effect of change in foreign statutory rates |  |  | 2,394
Permanent differences | (104) | 309 | 4,505
Foreign tax credits adjustment | 4,311 | 2,394 |
Increase/(decrease) in valuation allowance | (62,270) | (58,777) | (802)
Other | (106) |  | (12)
Total income tax expense (benefit) | $ (43,254) | $ 10,378 | $ 9,248

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