CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement Of Income And Comprehensive Income Abstract
NET INCOME (LOSS)	$ 68,510	$ 46,436	$ 5,398
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES (BENEFIT):
Net unrealized gain (loss) on investments, net of taxes (benefit)	0	0	0
Net unrealized gain (loss) on derivatives, net of taxes (benefit)	7,277	6,155	1,830
COMPREHENSIVE INCOME (LOSS)	$ 75,787	$ 52,591	$ 7,228