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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net income $ 40,755 $ 26,335 $ 68,413 $ 50,031
Other comprehensive income (loss):        
Foreign currency translation adjustments (4,446) 5,560 3,096 (33,930)
Change in unrealized gains (losses) on available-for-sale securities, net of tax of $388, $25, $1,222 and $158, respectively 636 (526) 2,001 256
Total other comprehensive income (loss) (3,810) 5,034 5,097 (33,674)
Comprehensive income $ 36,945 $ 31,369 $ 73,510 $ 16,357