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Subsequent Events (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Apr. 02, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 24, 2015
Jan. 27, 2015
Subsequent Event [Line Items]            
Proceeds from Sale of Property, Plant, and Equipment $ 46,100,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment $ 4,100,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment        
Gain on sale or acquisition, net   1,209,000epr_GainsLossesOnSalesOrAcquisitionsOfRealEstate 3,017,000epr_GainsLossesOnSalesOrAcquisitionsOfRealEstate 0epr_GainsLossesOnSalesOrAcquisitionsOfRealEstate    
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Proceeds from Sale of Property, Plant, and Equipment           42,700,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Gain on sale or acquisition, net           23,700,000epr_GainsLossesOnSalesOrAcquisitionsOfRealEstate
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Severance Costs         $ 18,500,000us-gaap_SeveranceCosts1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember