INCOME TAXES - Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 25	$ 0	$ 0
State	90	100	54
Total current	115	100	54
Deferred:
Federal	17,042	17,373	19,051
State	1,280	2,438	3,371
Total deferred	18,322	19,811	22,422
Income taxes (benefit)	$ 18,437	$ 19,911	$ 22,476