Income Taxes - Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current tax provision (benefit):
Federal	$ (3,801)	$ 3,801	$ (176)
State	111	1,035	838
Foreign			2,081
Total current payable	(3,690)	4,836	2,743
Deferred tax provision (benefit):
Federal	(77,430)	66,430	4,697
State	(6,106)	5,239	371
Total deferred payable	(83,536)	71,669	5,068
Provision for income taxes	$ (87,226)	$ 76,505	$ 7,811