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Income Taxes - Summary of Significant Components of the Income Tax Provision From Continuing Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 41 $ 1,693 $ 3,685
State (335) 2,573 1,716
Foreign 12,039 15,583 8,177
Total current 11,745 19,849 13,578
Deferred:      
Federal 1,860 19,893 8,427
State 860 1,761 (598)
Foreign 2,630 4,395 (157)
Total deferred 5,350 26,049 7,672
Income tax expense $ 17,095 $ 45,898 $ 21,250