Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 11,323	$ 3,887
Change in fair value of derivative instruments, accounted for as hedges, net of income tax benefit of $0 and $309, respectively	(3,418)	(3,910)
Comprehensive income (loss)	$ 7,905	$ (23)