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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]    
Allowance for doubtful accounts $ 4,023us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,700us-gaap_AllowanceForDoubtfulAccountsReceivable
Accumulated depreciation $ 440,586us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 433,935us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Common stock - par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock - shares authorized 250,000,000us-gaap_CommonStockSharesAuthorized 250,000,000us-gaap_CommonStockSharesAuthorized
Common stock - shares issued 109,353,001us-gaap_CommonStockSharesIssued 109,108,218us-gaap_CommonStockSharesIssued
Treasury stock - shares at cost 56,369,752us-gaap_TreasuryStockShares 56,369,752us-gaap_TreasuryStockShares