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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME    
Net income, as reported $ 177,980 $ 163,877
Other comprehensive income:    
Change in foreign currency translation adjustment 1,201 6,435
Available-for-sale investments:    
Change in net unrealized gains 131  
Net change in available-for-sale investments 131  
Other comprehensive income 1,332 6,435
Comprehensive income $ 179,312 $ 170,312