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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 149,572 $ 187,074 $ 121,485
Cash flow hedges:      
Net unrealized gain (loss), net of tax of ($22), $22, and $0 in 2016, 2015, and 2014, respectively (567) (27) (118)
Reclassification of net realized (gain) loss into current operations 398 201 46
Net change related to cash flow hedges (169) 174 (72)
Available-for-sale investments:      
Net unrealized gain (loss), net of tax of $248, ($279), and $40 in 2016, 2015, and 2014, respectively 1,672 (939) 579
Reclassification of net realized (gain) loss into current operations (191) (344) (673)
Net change related to available-for-sale investments 1,481 (1,283) (94)
Foreign currency translation adjustments:      
Foreign currency translation adjustments, net of tax of ($228), ($711) and ($870) in 2016, 2015, and 2014, respectively (5,616) (11,616) (9,400)
Net change related to foreign currency translation adjustments (5,616) (11,616) (9,400)
Other comprehensive income (loss), net of tax (4,304) (12,725) (9,566)
Total comprehensive income $ 145,268 $ 174,349 $ 111,919