CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement Of Income And Comprehensive Income Abstract
NET INCOME (LOSS)	$ (3,207)	$ 48,734	$ (4,256)	$ 49,755
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES (BENEFIT):
Net unrealized gain (loss) on investments, net of taxes (benefit)	0	0	0	0
Net unrealized gain (loss) on derivatives, net of taxes (benefit)	0	6,146	0	8,135
COMPREHENSIVE INCOME (LOSS)	$ (3,207)	$ 54,880	$ (4,256)	$ 57,890