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Income Taxes (Statutory Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statutory rate reconciliation |  |  |
Tax provision computed at U.S. statutory rate | $ 4,386 | $ 11,650 | $ 7,228
Foreign taxes not offset in U.S. by foreign tax credits | 16,015 | 24,840 | 6,775
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 |
Permanent differences | 180 | (104) | 309
Foreign tax credits expirations | 9,616 | 4,311 | 2,394
Increase/(decrease) in valuation allowance | (6,307) | (62,270) | (58,777)
Other |  | (106) |
Total income tax expense (benefit) | $ 23,890 | $ (43,254) | $ 10,378

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