Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 5,958	$ 1,670	$ 28,160	$ 10,506
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense (benefit) of $520, ($46), $520, and $485, respectively	4,533	(78)	1,975	819
Comprehensive income	$ 10,491	$ 1,592	$ 30,135	$ 11,325