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CONSOLIDATED BALANCE SHEET (PARENTHETICAL) UNAUDITED (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Parenthetical Balance Sheet [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 214,429us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 202,602us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 295,490us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 263,603us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Finite-Lived Intangible Assets, Accumulated Amortization 250,518us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 227,657us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Preferred Stock, No Par Value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred Stock, Shares Authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-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 or Stated Value Per Share $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 135,487,957us-gaap_CommonStockSharesIssued 134,623,736us-gaap_CommonStockSharesIssued
Treasury Stock, Shares 37,604,106us-gaap_TreasuryStockShares 34,013,923us-gaap_TreasuryStockShares
Interest Income, Notes Receivable 1,000ocr_InterestIncomeNotesReceivable  
Amortization of Financing Costs $ 1,000us-gaap_AmortizationOfFinancingCosts