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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 accounts receivable $ 1,058us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 760us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value      
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value      
Common stock, shares authorized 250,000,000us-gaap_CommonStockSharesAuthorized 250,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 56,435,555us-gaap_CommonStockSharesIssued 56,441,346us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 56,435,555us-gaap_CommonStockSharesOutstanding 56,441,346us-gaap_CommonStockSharesOutstanding