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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Foreign currency translation adjustments, tax $ 0 $ 0 $ 0
Change in marketable securities, tax $ 0 $ 0 $ 0