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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net income $ 43,665 $ 34,179
Other comprehensive income, net of tax:    
Unrealized gains on available-for-sale securities, net of taxes of $24 and $3 for March 31, 2016 and 2015, respectively 39 5
Unrealized losses on hedging derivatives, net of taxes of $148 and $153 for March 31, 2016 and 2015, respectively (238) (239)
Comprehensive income $ 43,466 $ 33,945