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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 177,178 $ 149,572 $ 187,074
Cash flow hedges:      
Net unrealized gain (loss), net of tax of ($5), ($22), and $22 in 2017, 2016, and 2015, respectively 4 (567) (27)
Reclassification of net realized (gain) loss into current operations (41) 398 201
Net change related to cash flow hedges (37) (169) 174
Available-for-sale investments:      
Net unrealized gain (loss), net of tax of $2, $248, and ($279) in 2017, 2016, and 2015, respectively 703 1,672 (939)
Reclassification of net realized (gain) loss into current operations (829) (191) (344)
Net change related to available-for-sale investments (126) 1,481 (1,283)
Foreign currency translation adjustments:      
Foreign currency translation adjustments, net of tax of $0, ($228) and ($711) in 2017, 2016, and 2015, respectively 21,992 (5,616) (11,616)
Net change related to foreign currency translation adjustments 21,992 (5,616) (11,616)
Other comprehensive income (loss), net of tax 21,829 (4,304) (12,725)
Total comprehensive income $ 199,007 $ 145,268 $ 174,349