CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Statement Of Income And Comprehensive Income Abstract
NET INCOME (LOSS)	$ 8,231	$ 10,689	$ 57,986	$ 29,151
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)	1,039	1,424	9,174	3,159
COMPREHENSIVE INCOME (LOSS)	$ 9,270	$ 12,113	$ 67,160	$ 32,310