Income Taxes - Provision for (Benefit From) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S. federal	$ 21,386	$ 42,693	$ 8,872
State and local	1,559	4,257	1,995
Foreign	7,139	6,176	971
Total current	30,084	53,126	11,838
Deferred:
U.S. federal	(2,255)	(73,544)	(19,161)
State and local	3,466	(1,361)	(771)
Foreign	(2,499)	(97)	51
Total deferred	(1,288)	(75,002)	(19,881)
Provision for (benefit from) income taxes	$ 28,796	$ (21,876)	$ (8,043)