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Income Taxes (Schedule of Current and Deferred Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |
Federal |  | $ (275) | $ (948) | $ (584)
State |  | (1,433) | (214) | (457)
Foreign |  | 179 | 178 | 97
Total current |  | (1,529) | (984) | (944)
Deferred: |  |  |  |
Federal |  | (28,161) | 4,306 | 8,037
State |  | (3,992) | 361 | 644
Foreign |  | (14) | (15) | (30)
Total deferred |  | (32,167) | 4,652 | 8,651
Provision (benefit) for income taxes | [1] | $ (33,696) | $ 3,668 | $ 7,707
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method

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