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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 27,626 $ 25,776 $ 71,291 $ 59,955
Other comprehensive income, net of tax:        
Unrealized gains (losses) on available-for-sale securities, net of taxes of $59 and $70 for the three months ended June 30, 2016 and 2015, respectively, and $83 and $67 for the six months ended June 30, 2016 and 2015, respectively 97 (110) 136 (105)
Unrealized gains (losses) on hedging derivatives, net of taxes of $53 and $40 for the three months ended June 30, 2016 and 2015, respectively, and $201 and $113 for the six months ended June 30, 2016 and 2015, respectively (87) 64 (325) (175)
Comprehensive income $ 27,636 $ 25,730 $ 71,102 $ 59,675