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Employee Compensation Plans - Stock Appreciation Rights (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 1,840,910 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber
Total weighted average strike price | $ 22.36 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsWeightedAverageStrikePrice
Total weighted average remaining contractual life | 2 years 4 months 24 days
Total weighted average fair value per share | $ 5.17 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsWeightedAverageFairValuePerShare
January 12, 2009 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 235,890 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber / us-gaap_AwardTypeAxis = opy_JanuaryTwelveTwoThousandNineMember
Strike price | $ 30.68 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice / us-gaap_AwardTypeAxis = opy_JanuaryTwelveTwoThousandNineMember
Remaining contractual life | 18 days
Fair value per share | $ 0 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare / us-gaap_AwardTypeAxis = opy_JanuaryTwelveTwoThousandNineMember
January 19, 2010 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 326,480 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber / us-gaap_AwardTypeAxis = opy_JanuaryNineteenTwoThousandTenMember
Strike price | $ 26.35 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice / us-gaap_AwardTypeAxis = opy_JanuaryNineteenTwoThousandTenMember
Remaining contractual life | 1 year
Fair value per share | $ 1.63 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare / us-gaap_AwardTypeAxis = opy_JanuaryNineteenTwoThousandTenMember
January 13, 2011 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 366,650 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber / us-gaap_AwardTypeAxis = opy_JanuaryThirteenTwoThousandElevenMember
Strike price | $ 18.94 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice / us-gaap_AwardTypeAxis = opy_JanuaryThirteenTwoThousandElevenMember
Remaining contractual life | 2 years
Fair value per share | $ 5.71 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare / us-gaap_AwardTypeAxis = opy_JanuaryThirteenTwoThousandElevenMember
January 19, 2012 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 403,340 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber / us-gaap_AwardTypeAxis = opy_JanuaryNineteenTwoThousandTwelveMember
Strike price | $ 15.94 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice / us-gaap_AwardTypeAxis = opy_JanuaryNineteenTwoThousandTwelveMember
Remaining contractual life | 3 years
Fair value per share | $ 8.36 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare / us-gaap_AwardTypeAxis = opy_JanuaryNineteenTwoThousandTwelveMember
January Fourteen Two Thousand Thirteen |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total Number of OARs outstanding | 508,550 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsOutstandingNumber / us-gaap_AwardTypeAxis = opy_JanuaryFourteenTwoThousandThirteenMember
Strike price | $ 23.48 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsStrikePrice / us-gaap_AwardTypeAxis = opy_JanuaryFourteenTwoThousandThirteenMember
Remaining contractual life | 4 years
Fair value per share | $ 6.94 opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsFairValuePerShare / us-gaap_AwardTypeAxis = opy_JanuaryFourteenTwoThousandThirteenMember

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