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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Expense (Benefit) [Abstract] |  |  |
Current federal tax expense (benefit) | $ 227 | $ (555) | $ 325
Deferred federal income tax expense (benefit) | 3,197 | (94) | (623)
Federal income tax expense (benefit), continuing operations | 3,424 | (649) | (298)
Current state and local tax expense (benefit) | 144 | 120 | (2)
Deferred state and local income tax expense (benefit) | 457 | 765 | 1,036
State and local income tax expense (benefit), continuing operations | 601 | 885 | 1,034
Current foreign tax expense (benefit) | 2,770 | 295 | 1,640
Deferred foreign income tax expense (benefit) | (1,248) | (118) | (1,092)
Foreign income tax expense (benefit), continuing operations | 1,522 | 177 | 548
Current income tax expense (benefit) | 3,141 | (140) | 1,963
Deferred income tax expense (benefit) | 2,406 | 553 | (679)
Net income tax expense | $ 5,547 | $ 413 | $ 1,284

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