INCOME TAXES - Expense (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 0	$ 0	$ (2,608)
State	(822)	(1,643)	150
Total current	(822)	(1,643)	(2,458)
Deferred:
Federal	10,481	(14,225)	19,246
State	2,815	1,657	3,807
Total deferred	13,296	(12,568)	23,053
Income taxes (benefit)	$ 12,474	$ (14,211)	$ 20,595