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Unaudited Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statements of Comprehensive Income [Abstract]        
Net income $ 15,002 $ 21,212 $ 32,233 $ 45,201
Other comprehensive income:        
Change in fair value of derivative instrument, net of income tax 883 94 1,022 53
Comprehensive income $ 15,885 $ 21,306 $ 33,255 $ 45,254