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	$ 31,018	$ 23,243	$ 78,628	$ 60,530
Gain on cash flow hedges, net of tax expense of $58, $301, $582, and $791, respectively	94	484	938	1,274
Comprehensive income	$ 31,112	$ 23,727	$ 79,566	$ 61,804