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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current provision: |  |  |
Federal | $ 3,074 | $ 4,280 | $ 6,440
State | 260 | 429 | 523
Total current provision | 3,334 | 4,709 | 6,963
Deferred provision: |  |  |
Federal benefit | (21,582) | (2,713) | (1,846)
Total deferred benefit | (21,582) | (2,713) | (1,846)
Total income tax expense (benefit) | $ (18,248) | $ 1,996 | $ 5,117

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