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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 25,776 $ 23,069 $ 59,955 $ 49,357
Other comprehensive income, net of tax:        
Unrealized losses on available-for-sale securities, net of taxes of $70 and $8 for the three months ended June 30, 2015 and 2014, respectively, and $67 and $18 for the six months ended June 30, 2015 and 2014, respectively (110) (12) (105) (28)
Unrealized gains (losses) on hedging derivatives, net of taxes of $40 and $95 for the three months ended June 30, 2015 and 2014, respectively, and $113 and $113 for the six months ended June 30, 2015 and 2014, respectively 64 (148) (175) (174)
Comprehensive income $ 25,730 $ 22,909 $ 59,675 $ 49,155