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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]    
Allowances for trade accounts receivable $ 2,250us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,924us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred Stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, shares authorized 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Stock, par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common Stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued 53,154,666us-gaap_CommonStockSharesIssued 53,363,450us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 53,154,666us-gaap_CommonStockSharesOutstanding 53,363,450us-gaap_CommonStockSharesOutstanding