CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract]
Net (loss) income	$ (10,720)	$ 55,486	$ (23,806)	$ 32,559
Other comprehensive income:
Net change in unrealized loss on auction rate securities	0	8	8	8
Total other comprehensive income	0	8	8	8
Comprehensive (loss) income	$ (10,720)	$ 55,494	$ (23,798)	$ 32,567