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Condensed Consolidated Statement of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Consolidated Statement of Comprehensive Income [Abstract]    
Net income $ 59,446 $ 46,120
Other comprehensive income, net of income taxes:    
Foreign currency translation adjustments 132 675
Unrealized loss on available-for-sale securities (144) (276)
Tax benefit, available-for-sale securities 43 94
Other comprehensive income, net of income taxes 31 493
Comprehensive income $ 59,477 $ 46,613