XML 103 R85.htm IDEA: XBRL DOCUMENT v2.4.1.9
Employee Compensation Plans - Schedule of Fair Value of Awarded Stock Option Estimated on Grant Date Using Black-Scholes Model (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Term granted for options 5 years [1] 5 years [1] 5 years [1] 5 years [1] 4 years 6 months [1]
Expected volatility factor 56.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2] 53.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2] 54.95%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2] 52.52%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2] 48.58%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2]
Risk-free interest rate 1.49%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [3] 0.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [3] 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [3] 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [3] 2.62%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [3]
Actual dividends $ 0.44opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed [4] $ 0.44opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed [4] $ 0.44opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed [4] $ 0.44opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed [4] $ 0.44opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed [4]
[1] The expected term was determined based on actual awards.
[2] The volatility factor was measured using the weighted average of historical daily price changes of the Company’s Class A Stock over a historical period commensurate to the expected term of the awards.
[3] The risk-free interest rate was based on periods equal to the expected term of the awards based on the U.S. Treasury yield curve in effect at the time of grant.
[4] Actual dividends were used to compute the expected annual dividend yield.