NET INCOME (LOSS) PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator [Abstract]
Net income (loss) - Basic			$ 9,743	$ (8,568)
Denominator [Abstract]
Weighted average common shares outstanding - Basic	45,953,312	45,024,373	45,871,166	41,977,113
Weighted average common shares outstanding - Diluted	46,857,309	45,201,175	46,896,898	41,977,113
Net income (loss) per common share [Abstract]
Basic	$ 0.24	$ 0.07	$ 0.21	$ (0.20)
Diluted	$ 0.23	$ (0.03)	$ 0.21	$ (0.20)
Anti-dilutive shares excluded from the calculation of diluted net loss per common share (in shares)	48,366	2,088,014	189,552	2,302,760