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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Trade accounts receivable, allowance for doubtful accounts $ 11,795 $ 12,619
Preferred stock, shares authorized 5,000,000 5,000,000
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 289,654,284 295,867,844
Common stock, shares outstanding 289,654,284 295,867,844