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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 189,682 $ 144,020 $ 145,832
Net change in foreign currency translation adjustment (670) (154) (196)
Change in unrealized gains (losses) on investments, net of tax 712 (686) (238)
Other comprehensive income (loss) 42 (840) (434)
Comprehensive income $ 189,724 $ 143,180 $ 145,398