INCOME TAXES - Significant Components of the Provision for Income Taxes ( (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense:
Federal	$ 305	$ 0	$ 69
State	0	0	0
Total current tax expense	305	0	69
Deferred tax expense (benefit):
Federal	7,924	432	(1,163)
State	1,981	2,042	(253)
Total deferred tax expense (benefit)	9,905	2,474	(1,416)
Income tax expense (benefit) before change in deferred tax asset valuation allowance	10,210	2,474	(1,347)
Change in deferred tax asset valuation allowance	(4,797)	(460)	(1,869)
Income tax expense (benefit)	$ 5,413	$ 2,014	$ (3,216)