Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 133,825	$ 13,601	$ (8,200)
Change in fair value of interest rate swap agreements, net of tax	234	0	0
Comprehensive income (loss)	$ 134,059	$ 13,601	$ (8,200)