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Mortgage Notes Receivable (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Jan. 10, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2014
Mortgage Loans on Real Estate [Line Items]            
Mortgage notes receivable $ 1,900us-gaap_MortgageLoansOnRealEstate [1]   $ 125,547us-gaap_MortgageLoansOnRealEstate [1] $ 162,191us-gaap_MortgageLoansOnRealEstate $ 97,381us-gaap_MortgageLoansOnRealEstate  
Construction Loans [Member]            
Mortgage Loans on Real Estate [Line Items]            
Mortgage notes receivable 0us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember		   79,969us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember		      
Construction Loans [Member] | Oklahoma [Member] | Medical Office Building [Member]            
Mortgage Loans on Real Estate [Line Items]            
Face Amount 94,889us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_OK		          
Interest Rate 7.72%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_OK		          
Mortgage notes receivable 0us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_OK		   79,969us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_OK		      
Other Mortgage Loans [Member]            
Mortgage Loans on Real Estate [Line Items]            
Mortgage notes receivable 1,900us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember		   45,578us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember		      
Other Mortgage Loans [Member] | Iowa [Member] | Other Property [Member]            
Mortgage Loans on Real Estate [Line Items]            
Face Amount 40,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA		         40,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA
Interest Rate 7.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA		 7.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA		        
Mortgage notes receivable 0us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA		   39,973us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_IA		      
Other Mortgage Loans [Member] | Florida [Member] | Medical Office Building [Member]            
Mortgage Loans on Real Estate [Line Items]            
Face Amount 3,750us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL		          
Interest Rate 7.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL		          
Mortgage notes receivable 0us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL		   3,750us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_FL		      
Other Mortgage Loans [Member] | Texas [Member] | Land [Member]            
Mortgage Loans on Real Estate [Line Items]            
Face Amount 3,666us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_LandMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		          
Mortgage notes receivable 0us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_LandMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		   1,855us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_LandMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		      
Other Mortgage Loans [Member] | Texas [Member] | Land [Member] | Minimum [Member]            
Mortgage Loans on Real Estate [Line Items]            
Interest Rate 5.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_LandMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		          
Other Mortgage Loans [Member] | Texas [Member] | Land [Member] | Maximum [Member]            
Mortgage Loans on Real Estate [Line Items]            
Interest Rate 6.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_LandMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		          
Other Mortgage Loans [Member] | Nevada [Member] | Medical Office Building [Member]            
Mortgage Loans on Real Estate [Line Items]            
Face Amount 1,900us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NV		          
Interest Rate 6.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NV		          
Mortgage notes receivable $ 1,900us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NV		   $ 0us-gaap_MortgageLoansOnRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= hr_OtherMortgageLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= hr_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NV		      
[1] Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.