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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) - USD ($)
12 Months Ended
Sep. 08, 2017
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument, Gross      
2021   $ 176,109,000  
2022   151,153,000  
2023   101,199,000  
2024   76,247,000  
2025   76,297,000  
Thereafter   45,271,000  
Total   626,276,000  
Unamortized Debt Issuance Costs      
2021   (647,000)  
2022   (499,000)  
2023   (274,000)  
2024   (207,000)  
2025   (115,000)  
Thereafter   (260,000)  
Unamortized Debt Issuance Costs   (2,002,000) $ (2,769,000)
Debt Instrument, Net      
2021   175,462,000  
2022   150,654,000  
2023   100,925,000  
2024   76,040,000  
2025   76,182,000  
Thereafter   45,011,000  
Total debt   624,274,000  
Revolving Credit Facility [Member]      
Debt Instrument, Gross      
2021   175,000,000  
Total   $ 175,000,000  
Debt Instrument, Net      
Line of credit facility extension allowed period 1 year 1 year  
Term Loan [Member]      
Debt Instrument, Gross      
2022   $ 150,000,000  
2023   100,000,000  
2024   75,000,000  
2025   75,000,000  
Total   400,000,000  
Mortgage Loans Payable [Member]      
Debt Instrument, Gross      
2021   1,074,000  
2022   1,116,000  
2023   1,160,000  
2024   1,206,000  
2025   1,253,000  
Thereafter   39,836,000  
Total   45,645,000  
Finance Lease Obligation [Member]      
Debt Instrument, Gross      
2021   35,000  
2022   37,000  
2023   39,000  
2024   41,000  
2025   44,000  
Thereafter   5,435,000  
Total   $ 5,631,000