Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (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									$ 7,814	$ 13,422	$ 31,409
State									4,589	1,909	3,819
Foreign									3,541	3,903	4,639
Total									15,944	19,234	39,867
Deferred:
Federal									4,584	5,582	(2,229)
State									(619)	937	276
Foreign									948	593	(797)
Total									4,913	7,112	(2,750)
Total income tax provision	$ 4,669	$ 4,391	$ 5,607	$ 6,190	$ 6,705	$ 8,806	$ 8,722	$ 2,113	$ 20,857	$ 26,346	$ 37,117