Income Taxes - Sources of Income (Loss) Before Taxes and Components of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Sources of income (loss) before income taxes
Domestic									$ (85,278)	$ (59,212)	$ (12,487)
Foreign									46,128	(8,468)	(16,866)
Loss before income taxes									(39,150)	(67,680)	(29,353)
Current:
Federal									0	0	(166)
State and local									2	65	116
Foreign									10,002	8,905	5,494
Deferred:
Federal									0	(346)	(1,263)
Foreign									(1,940)	(5,906)	(4,157)
Total income tax expense	$ 148	$ 3,790	$ 2,719	$ 1,407	$ (587)	$ 2,079	$ 154	$ 1,072	$ 8,064	$ 2,718	$ 24