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Income Taxes - Components of Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal     $ 139
Foreign $ (2,246) $ 1,937 6,952
State and local 15 (111) (407)
Total current expense (benefit) for income taxes (2,231) 1,826 6,684
Deferred:      
Federal (34,786) 1,459 2,104
Foreign 1,652 (646) 516
State and local (742) 127 28
Total deferred expense (benefit) for income taxes (33,876) 940 2,648
Total expense (benefit) for income taxes $ (36,107) $ 2,766 $ 9,332