Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
State		$ 91
Total current		91
Deferred:
Federal	$ 515	(26,214)	$ 21,803
State	13	(319)	302
Total deferred	528	(26,533)	22,105
Total income tax provision (benefit)	$ 528	$ (26,442)	$ 22,105