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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Tax effect of unrealized gain on cash flow hedges $ (5) $ (22) $ 22
Tax effect of unrealized gain (loss) on available-for-sale investments 2 248 (279)
Tax effect of foreign currency translation adjustment $ 0 $ (228) $ (711)