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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Foreign currency translation adjustment, tax benefit (expense) $ (348) $ 266 $ 132
Unrealized gain (loss) on available-for-sale securities, tax benefit (expense) $ (32) $ 71 $ (76)