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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 187,074 $ 121,485 $ 73,573
Cash flow hedges:      
Net unrealized gain (loss), net of tax of $22, $0, and $13 in 2015, 2014, and 2013, respectively (27) (118) 104
Reclassification of net realized (gain) loss into current operations 201 46 0
Net change related to cash flow hedges 174 (72) 104
Available-for-sale investments:      
Net unrealized gain (loss), net of tax of ($279), $40, and ($147) in 2015, 2014, and 2013, respectively (939) 579 (190)
Reclassification of net realized (gain) loss into current operations (344) (673) (314)
Net change related to available-for-sale investments (1,283) (94) (504)
Foreign currency translation adjustments:      
Foreign currency translation adjustments, net of tax of ($711), ($870), and $22 in 2015, 2014, and 2013, respectively (11,616) (9,400) 82
Net change related to foreign currency translation adjustments (11,616) (9,400) 82
Other comprehensive income (loss), net of tax (12,725) (9,566) (318)
Total comprehensive income $ 174,349 $ 111,919 $ 73,255