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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 07, 2011
--- | --- | --- | --- | ---
Allowance for credit losses | $ 2,427 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 2,423 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |
Amounts pledged | 518,123 us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue | 586,625 us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue |  |
Net accumulated depreciation | 103,547 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 97,118 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  |
Net Deferred Tax Assets | 68,622 us-gaap_DeferredTaxAssetsGross | 69,805 us-gaap_DeferredTaxAssetsGross |  |
Notes Receivable, Net Accumulated Amortization | 42,211 opy_AccountsandNotesReceivableAccumulatedAmortization | 54,465 opy_AccountsandNotesReceivableAccumulatedAmortization |  |
Notes Receivable, Net Allowance for Uncollectibles | $ 8,606 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 9,718 us-gaap_FinancingReceivableAllowanceForCreditLosses |  |
Class A Stock |  |  |  |
Common stock, authorized | 50,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 50,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Common stock, shares issued | 13,530,688 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 13,377,967 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 13,572,265 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, shares outstanding | 13,530,688 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 13,377,967 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 13,508,318 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Common stock, par value | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Class B Stock |  |  |  |
Common stock, authorized | 99,680 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |
Common stock, shares issued | 99,680 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 99,680 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Common stock, shares outstanding | 99,680 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 99,680 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Common stock, par value | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |

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