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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income $ 33,342 $ 29,016 $ 93,297 $ 78,373
Other comprehensive income, net of tax:        
Unrealized gains (losses) on available-for-sale securities, net of taxes of $74 and $8 for the three months ended September 30, 2015 and 2014, respectively, and $7 and $10 for the nine months ended September 30, 2015 and 2014, respectively 118 12 13 (16)
Unrealized gains (losses) on hedging derivatives, net of taxes of $154 and $39 for the three months ended September 30, 2015 and 2014, respectively, and $267 and $73 for the nine months ended September 30, 2015 and 2014, respectively (257) 61 (432) (113)
Comprehensive income $ 33,203 $ 29,089 $ 92,878 $ 78,244