Income Taxes - Total Income Tax (Benefit) Expense (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
Current taxes:
Federal taxes									$ (15,758)	$ (144)	$ (6,352)
State taxes									597	20	93
Foreign taxes									47	184	295
Current taxes									(15,114)	60	(5,964)
Deferred taxes:
Federal taxes									0	0	(1,319)
State taxes									1,898	253	(3,181)
Foreign taxes									6	(20)	(64)
Deferred taxes									1,904	233	(4,564)
Income tax (benefit) expense	$ (13,501)	$ 93	$ 72	$ 126	$ 89	$ 29	$ 0	$ 175	$ (13,210)	$ 293	$ (10,528)