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Equity Incentive Plans Equity Incentive Plans (Schedule of Nonvested Shares Unamortized Share-based Compensation Expense to be Recognized in the Future) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested shares unamortized share-based compensation expense to be recognized in 2015 $ 5,391epr_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinOneYear
Nonvested shares unamortized share-based compensation expense to be recognized in 2016 3,957epr_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinYearTwo
Nonvested shares unamortized share-based compensation expense to be recognized in 2017 2,030epr_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinYearThree
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options $ 11,378us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions