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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 129,437 $ 143,086 $ 133,046
Other comprehensive income:      
Foreign currency translation adjustment, net of taxes of $114, $2,483 and $(8,056), respectively 18,264 (13,127) (18,967)
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of $(325), $784 and $84, respectively (152) (1,423) 590
Less: Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of $756, $(935) and $169, respectively (308) 1,697 (1,371)
Total other comprehensive income 17,804 (12,853) (19,748)
Comprehensive income $ 147,241 $ 130,233 $ 113,298