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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 16,245 $ 13,160
Common stock, shares issued 263,640,287 263,140,777
Common stock, shares outstanding 263,443,234 262,803,271
Treasury shares 197,053 337,397