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Income Taxes (Components of the Provision(Benefit) for Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
State |  |  |  |  |  |  |  |  | 37 | (100) | 54
Foreign |  |  |  |  |  |  |  |  | 964 | 932 | 163
Total Current |  |  |  |  |  |  |  |  | 1,001 | 832 | 217
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 727 | 293 | 300
State |  |  |  |  |  |  |  |  | 131 | 31 | 10
Foreign |  |  |  |  |  |  |  |  | (329) | (117) | (605)
Total Deferred |  |  |  |  |  |  |  |  | 529 | 207 | (295)
Provision (benefit) for income taxes | $ 961 | $ 308 | $ 158 | $ 103 | $ 854 | $ 190 | $ 238 | $ (243) | $ 1,530 | $ 1,039 | $ (78)

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