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Mortgage Loans Payable and Unsecured Credit Facilities (Schedule of Principal Payments on Mortgage Loan Payable, Finance Lease Obligation, Unsecured Term Loans, and Unsecured Credit Facility) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Term
Dec. 31, 2020
USD ($)
Debt Instrument, Gross    
2022 $ 1,153,000  
2023 101,199,000  
2024 142,247,000  
2025 76,297,000  
2026 90,970,000  
Thereafter 118,301,000  
Total 530,167,000  
Unamortized Debt Issuance Costs    
2022 (600,000)  
2023 (518,000)  
2024 (451,000)  
2025 (359,000)  
2026 (243,000)  
Thereafter (958,000)  
Unamortized Debt Issuance Costs (3,129,000) $ (2,002,000)
Debt Instrument, Net    
2022 553,000  
2023 100,681,000  
2024 141,796,000  
2025 75,938,000  
2026 90,727,000  
Thereafter 117,343,000  
Total debt 527,038,000  
Revolving Credit Facility [Member]    
Debt Instrument, Gross    
2024 66,000,000  
Total $ 66,000,000  
Debt Instrument, Net    
Line of credit facility extension allowed term | Term 2  
Line of credit facility extension allowed period 1 year  
Term Loan [Member]    
Debt Instrument, Gross    
2023 $ 100,000,000  
2024 75,000,000  
2025 75,000,000  
2026 50,000,000  
Total 300,000,000  
Mortgage Loans Payable [Member]    
Debt Instrument, Gross    
2022 1,116,000  
2023 1,160,000  
2024 1,206,000  
2025 1,253,000  
2026 40,922,000  
Thereafter 112,914,000  
Total 158,571,000  
Finance Lease Obligation [Member]    
Debt Instrument, Gross    
2022 37,000  
2023 39,000  
2024 41,000  
2025 44,000  
2026 48,000  
Thereafter 5,387,000  
Total $ 5,596,000