Income Taxes (Details 2) - 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
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]
Foreign									$ 14,343	$ 7,058	$ 2,821
U.S. federal									0	0	0
U.S. state									650	383	0
Current income tax provision (benefit)									14,993	7,441	2,821
Foreign									9,610	5,318	4,071
U.S. federal									(664)	(15,379)	5,142
U.S. state									(635)	232	(766)
Deferred income tax provision (benefit)									8,311	(9,829)	8,447
Provision (benefit) for income taxes	$ 6,531	$ (2,697)	$ (3,613)	$ 23,083	$ 31,141	$ (37,249)	$ 3,625	$ 95	$ 23,304	$ (2,388)	$ 11,268