Debt and Derivative Instruments (Schedule of Principal Payments and Maturities of Company's Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
2022	$ 231,161
2023	227,763
2024	341
2025	92,951
2026	44,727
Total debt before unamortized mortgage premiums and debt issuance costs including impact of interest rate swaps	596,943	$ 631,017
Maturity of Credit Facility [Member]
Debt Instrument [Line Items]
2022	129,000
2023	150,000
Total debt before unamortized mortgage premiums and debt issuance costs including impact of interest rate swaps	279,000
Scheduled Principal Payments [Member]
Debt Instrument [Line Items]
2022	624
2023	326
2024	341
2025	295
Total debt before unamortized mortgage premiums and debt issuance costs including impact of interest rate swaps	1,586
Maturities of Mortgage Loans [Member]
Debt Instrument [Line Items]
2022	101,537
2023	77,437
2025	92,656
2026	44,727
Total debt before unamortized mortgage premiums and debt issuance costs including impact of interest rate swaps	$ 316,357

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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-Section 50
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