INCOME TAXES (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Activity related to unrecognized tax benefits
Gross unrecognized tax benefits at the beginning of the period	$ 6,952,000	$ 6,412,000	$ 5,507,000
Increase in uncertain tax positions	3,384,000	590,000	1,030,000
Lapse in statute of limitations		(50,000)	(125,000)
Gross unrecognized tax benefits at the end of the period	10,336,000	6,952,000	6,412,000
Unrecognized tax benefits that would affect the effective tax rate if recognized	$ 10,300,000