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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 15,305 $ 17,154
Common stock, shares issued 263,506,592 263,660,803
Common stock, shares outstanding 263,372,910 263,494,670
Treasury shares 133,682 166,133