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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 404,389 $ 333,817 $ 331,655
Other comprehensive gain (loss), net of tax:      
Foreign currency translation adjustments 17,597 (12,131) (14,900)
Unrealized holding gain (loss) on investments:      
Unrealized holding gains (losses) during the period, net of income taxes of $1, $457 and $822 190 (918) (1,659)
Less: reclassification adjustment for losses realized in net income, net of income taxes of $(99), $(201) and $(76) 260 384 164
Total other comprehensive gain (loss), net of taxes 18,047 (12,665) (16,395)
Comprehensive income $ 422,436 $ 321,152 $ 315,260