Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Sources of income (loss) before income taxes
Domestic									$ (41,246)	$ 21,065	$ (162,151)
Foreign									(19,060)	(42,175)	55,215
Loss before income taxes									(60,306)	(21,110)	(106,936)
Current:
Federal									0	(4,715)	(678)
State and local									28	41	(42)
Foreign									5,574	1,274	21,722
Deferred:
Federal									0	2,726	1,004
Foreign									(1,181)	4,718	(1,424)
Income tax expense	$ (1,444)	$ 3,316	$ 2,256	$ 293	$ 447	$ 2,082	$ 532	$ 983	$ 4,421	$ 4,044	$ 20,582