Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 10,879	$ 4,949	$ 22,202	$ 8,836
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense of $0, $840, $0, and $531, respectively	860	4,807	(2,558)	897
Comprehensive income	$ 11,739	$ 9,756	$ 19,644	$ 9,733