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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Trade accounts receivable, allowance for doubtful accounts $ 13,316us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 12,619us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, shares authorized 400,000,000us-gaap_CommonStockSharesAuthorized 400,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 293,955,044us-gaap_CommonStockSharesIssued 295,867,844us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 293,955,044us-gaap_CommonStockSharesOutstanding 295,867,844us-gaap_CommonStockSharesOutstanding