INCOME TAXES - Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ (33)	$ 25	$ 0
State	139	90	100
Total current	106	115	100
Deferred:
Federal	19,980	17,042	17,373
State	(5,292)	1,280	2,438
Total deferred	14,688	18,322	19,811
Income taxes (benefit)	$ 14,794	$ 18,437	$ 19,911