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Debt - Mortgages Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Principal	$ 1,225,434,000
Total	1,225,188,000
Mortgages [Member]
Debt Instrument [Line Items]
Total Principal	33,434,000	$ 37,115,000
Unamortized debt issuance costs	(312,000)	(417,000)
Total	33,122,000	36,698,000
Notes Payable Due February 2020 6.24 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total Principal		2,775,000
Debt Instrument, Periodic Payment, Principal	$ 23,004
Debt Instrument, Interest Rate, Stated Percentage	6.24%
Notes Payable Due January 2023 3.60 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total Principal	$ 23,640,000	23,640,000
Debt Instrument, Interest Rate, Stated Percentage	3.60%
Notes Payable Due September 2023 5.01 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total Principal	$ 4,622,000	4,779,000
Debt Instrument, Periodic Payment, Principal	35,673
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 4,034,627
Debt Instrument, Interest Rate, Stated Percentage	5.01%
Notes Payable Due July 2026 6.27 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total Principal	$ 5,172,000	$ 5,921,000
Debt Instrument, Periodic Payment, Principal	$ 91,675
Debt Instrument, Interest Rate, Stated Percentage	6.27%

X

- Definition

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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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments applied to principal.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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