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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:                      
Federal                 $ (3,792) $ 14,299 $ (90)
State                 97 141 5
Foreign                 10,833 3,287 5,915
Total current                 7,138 17,727 5,830
Deferred:                      
Federal                 (333) 6,043 (2,985)
State                 15 (200) 115
Foreign                 (7,113) 7,210 (2,097)
Total deferred                 (7,431) 13,053 (4,967)
Total $ 650 $ (1,702) $ (872) $ 629 $ 27,786 $ 2,558 $ 313 $ 233 $ (293) $ 30,780 $ 863