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Unaudited Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statements of Comprehensive Income [Abstract]    
Net income $ 14,783 $ 17,231
Other comprehensive income:    
Change in fair value of derivative instrument, net of income tax 75 139
Comprehensive income $ 14,858 $ 17,370