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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustments, tax $ 0 $ 0 $ 0 $ 0
Change in marketable securities, tax $ 0 $ 0 $ 0 $ 0