Income Taxes - Summary of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal	$ 578	$ 310	$ 160
State	61	12	7
Deferred
Federal	10,818	3,440	(30,540)
State	2,070	782	(10,012)
Income tax provision (benefit)	$ 13,527	$ 4,544	$ (40,385)