Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 58,935	$ 21,710	$ 123,895	$ 44,496
Other comprehensive income, net of tax:
Unrealized gain on interest rate swaps		1,614	2,228	4,806
Total comprehensive income	$ 58,935	$ 23,324	$ 126,123	$ 49,302