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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: |  |  |
Federal | $ 10,012 | $ 25,234 | $ (5,059)
State | 879 | 1,803 | (8,258)
Foreign | 0 | 169 | 62
Deferred: |  |  |
Federal | 114,059 | 67,109 | 19,487
State | 6,942 | 12,495 | 4,706
Foreign | 0 | 0 | 3
Total | $ 131,892 | $ 106,810 | $ 10,941

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