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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Trade accounts receivables, allowance for doubtful accounts $ 1,563us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,614us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 78,031,000us-gaap_CommonStockSharesIssued 80,053,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 78,031,000us-gaap_CommonStockSharesOutstanding 80,053,000us-gaap_CommonStockSharesOutstanding