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Income Taxes (Components of Income Tax Provision) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ (1,314) | $ 442 | $ 3,944
State | 675 | (85) | 390
Foreign | 488 | (526) | 1,841
Total current | (151) | (169) | 6,175
Deferred: |  |  |
Federal | 8,701 | 1,564 | (2,628)
State | 337 | (112) | (63)
Foreign | (45) | (46) | (8)
Total deferred | 8,993 | 1,406 | (2,699)
Income tax expense | $ 8,842 | $ 1,237 | $ 3,476

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