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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Rate
Dec. 31, 2013
Rate
Dec. 31, 2012
Rate
Dec. 31, 2011
Income Tax Provision [Abstract]                        
Current Income Tax Expense (Benefit)                 $ 20,454,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 27,160,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 7,962,000us-gaap_CurrentIncomeTaxExpenseBenefit  
Deferred Income Tax Expense (Benefit)                 92,700,000us-gaap_DeferredIncomeTaxExpenseBenefit 61,932,000us-gaap_DeferredIncomeTaxExpenseBenefit 95,327,000us-gaap_DeferredIncomeTaxExpenseBenefit  
Income Tax Expense (Benefit) (4,487,000)us-gaap_IncomeTaxExpenseBenefit 38,948,000us-gaap_IncomeTaxExpenseBenefit 39,020,000us-gaap_IncomeTaxExpenseBenefit 39,673,000us-gaap_IncomeTaxExpenseBenefit 55,088,000us-gaap_IncomeTaxExpenseBenefit (26,350,000)us-gaap_IncomeTaxExpenseBenefit 29,754,000us-gaap_IncomeTaxExpenseBenefit 30,600,000us-gaap_IncomeTaxExpenseBenefit 113,154,000us-gaap_IncomeTaxExpenseBenefit 89,092,000us-gaap_IncomeTaxExpenseBenefit 103,289,000us-gaap_IncomeTaxExpenseBenefit  
Tax Benefit from Stock Options Exercised                 9,000,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 200,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 3,000,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised  
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                        
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate                 104,086,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 60,897,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 96,331,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount                 (4,524,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 3,122,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 535,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent                 (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance  
income tax reconciliation, state, local and foreign income taxes, net of federal income tax benefit                 11,233,000ocr_IncomeTaxReconciliationStateLocalAndForeignIncomeTaxesNetOfFederalIncomeTaxBenefit 8,142,000ocr_IncomeTaxReconciliationStateLocalAndForeignIncomeTaxesNetOfFederalIncomeTaxBenefit 9,491,000ocr_IncomeTaxReconciliationStateLocalAndForeignIncomeTaxesNetOfFederalIncomeTaxBenefit  
Effective Income Tax Reconciliation, state, local and foreign income taxes, net of federal income tax benefit                 3.80%ocr_EffectiveIncomeTaxReconciliationStateLocalAndForeignIncomeTaxesNetOfFederalIncomeTaxBenefit 4.70%ocr_EffectiveIncomeTaxReconciliationStateLocalAndForeignIncomeTaxesNetOfFederalIncomeTaxBenefit 3.40%ocr_EffectiveIncomeTaxReconciliationStateLocalAndForeignIncomeTaxesNetOfFederalIncomeTaxBenefit  
Effective Income Tax Rate Reconciliation, Expiration of NOL, amount                 5,812,000ocr_EffectiveIncomeTaxRateReconciliationExpirationofNOLamount 0ocr_EffectiveIncomeTaxRateReconciliationExpirationofNOLamount 0ocr_EffectiveIncomeTaxRateReconciliationExpirationofNOLamount  
Effective Income Tax Rate Reconciliation, Expiration of NOL, rate                 2.00%ocr_EffectiveIncomeTaxRateReconciliationExpirationofNOLrate 0.00%ocr_EffectiveIncomeTaxRateReconciliationExpirationofNOLrate 0.00%ocr_EffectiveIncomeTaxRateReconciliationExpirationofNOLrate  
Income Tax Reconciliation, Tax Settlements                 (2,619,000)us-gaap_IncomeTaxReconciliationTaxSettlements 17,136,000us-gaap_IncomeTaxReconciliationTaxSettlements 0us-gaap_IncomeTaxReconciliationTaxSettlements  
Effective Income Tax Rate Reconciliation, Tax Settlements                 (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 9.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements  
Income Tax Reconciliation, Other Adjustments                 (834,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (205,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (3,068,000)us-gaap_IncomeTaxReconciliationOtherAdjustments  
Effective Income Tax Rate Reconciliation, Other Adjustments                 (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments  
Effective Income Tax Rate, Continuing Operations                 38.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 51.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Income Taxes Paid                 56,000,000us-gaap_IncomeTaxesPaid 12,000,000us-gaap_IncomeTaxesPaid 44,000,000us-gaap_IncomeTaxesPaid  
Deferred Tax Assets, Valuation Allowance 95,712,000us-gaap_DeferredTaxAssetsValuationAllowance       24,159,000us-gaap_DeferredTaxAssetsValuationAllowance       95,712,000us-gaap_DeferredTaxAssetsValuationAllowance 24,159,000us-gaap_DeferredTaxAssetsValuationAllowance    
Current Fiscal Year End Date                 --12-31      
Valuation Allowance, Deferred Tax Asset, Explanation of Change                 71553      
Unrecognized Tax Benefits $ 16,465,000us-gaap_UnrecognizedTaxBenefits       $ 14,822,000us-gaap_UnrecognizedTaxBenefits       $ 16,465,000us-gaap_UnrecognizedTaxBenefits $ 14,822,000us-gaap_UnrecognizedTaxBenefits $ 14,216,000us-gaap_UnrecognizedTaxBenefits $ 17,091,000us-gaap_UnrecognizedTaxBenefits