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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 400,235 $ 231,418 $ 189,682
Net change in foreign currency translation adjustment (3,631) 1,741 (670)
Change in unrealized gains (losses) on investments, net of tax 286 (232) 712
Other comprehensive income (loss) (3,345) 1,509 42
Comprehensive income $ 396,890 $ 232,927 $ 189,724