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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ASSETS    
Accounts receivable, allowance $ 12,193us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 13,787us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
PROPERTY, EQUIPMENT AND FACILITIES - accumulated depreciation and amortization 136,910us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 146,795us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
OTHER ASSETS :    
Noncurrent receivables, allowance $ 1,016us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent $ 982us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent
LIABILITIES AND STOCKHOLDERS' EQUITY    
Preferred stock, par value (in dollars per share) $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized (in shares) 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized (in shares) 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 29,933,086us-gaap_CommonStockSharesIssued 29,919,761us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 29,933,086us-gaap_CommonStockSharesOutstanding 29,919,761us-gaap_CommonStockSharesOutstanding
Treasury stock, shares (in shares) 5,910,541us-gaap_TreasuryStockShares 5,910,541us-gaap_TreasuryStockShares