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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Domestic | $ 26,713 | $ 11,958 | $ 13,293
Foreign | 6,222 | 5,491 | 4,614
State | 3,789 | 2,075 | 2,947
Provision for current income tax expense (benefit) | 36,724 | 19,524 | 20,854
Deferred: |  |  |
Domestic | 1,711 | 1,580 | 3,481
Foreign | (155) | 934 | (718)
State | (228) | 106 | 41
Provision for deferred income tax expense (benefit) | 1,328 | 2,620 | 2,804
Total income taxes | $ 38,052 | $ 22,144 | $ 23,658

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