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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 39,847 $ 27,626 $ 95,759 $ 71,291
Other comprehensive income, net of tax:        
Unrealized (losses) gains on available-for-sale securities, net of taxes of $10 and $59 for the three months ended June 30, 2017 and 2016, respectively, and $232 and $83 for the six months ended June 30, 2017 and 2016, respectively (17) 97 376 136
Unrealized losses on hedging derivatives, net of taxes of $42 and $53 for the three months ended June 30, 2017 and 2016, respectively, and $45 and $201 for the six months ended June 30, 2017 and 2016, respectively (69) (87) (74) (325)
Comprehensive income $ 39,761 $ 27,636 $ 96,061 $ 71,102