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Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current tax expense: |  |  |  |
Federal |  | $ (1,077) | $ 1,744 | $ 312
State |  | 777 | 2,101 | 159
Foreign |  | 8,036 | 9,421 | 7,111
Current income tax expense (benefit) |  | 7,736 | 13,266 | 7,582
Deferred income tax expense (benefit) |  | 2,063 | (40,021) | (2,871)
Provision (benefit) for income taxes |  | 9,799 | (26,755) | $ 4,711
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit) | $ (31,900) |  | $ (31,900) |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Deferred Tax Revaluation, Income Tax Expense (Benefit) |  | 1,300 |  |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Foreign Items, Income Tax Expense (Benefit) |  | (400) |  |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) |  | $ (31,000) |  |

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