Income Taxes - Schedule of Components of 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									$ 1,730	$ 3,568	$ 8,002
Foreign									3,818	4,345	2,855
State and local									699	1,169	943
Total current expense									6,247	9,082	11,800
Deferred expense
Federal									8,829	47,073	2,992
Foreign									12	323	137
State and local									711	569	238
Total deferred expense									9,552	47,965	3,367
Provision for income taxes	$ 7,370	$ 3,420	$ 3,147	$ 1,862	$ 46,262	$ 3,021	$ 4,735	$ 3,030	$ 15,799	$ 57,047	$ 15,167