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Debt - Mortgages Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total	$ 876,100,000
Repayments Of Secured Debt	24,404,000	$ 27,576,000	$ 2,412,000
Mortgages [Member]
Debt Instrument [Line Items]
Total	37,115,000	61,519,000
Unamortized debt issuance costs	(417,000)	(593,000)
Long-term Debt, Total	36,698,000	60,926,000
Notes Payable Due October 2019 3.32 percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total	$ 0	21,500,000
Debt Instrument, Interest Rate, Stated Percentage	3.32%
Notes Payable Due September 2190 6.90 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total		1,922,000
Debt Instrument, Periodic Payment, Principal	$ 153,838
Debt Instrument, Interest Rate, Stated Percentage	6.90%
Notes Payable Due February 2020 6.24 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total	$ 2,775,000	2,872,000
Debt Instrument, Periodic Payment, Principal	23,004
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 2,781,819
Debt Instrument, Interest Rate, Stated Percentage	6.24%
Notes Payable Due January 2023 3.60 Percent [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Total	$ 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	$ 4,779,000	4,959,000
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	$ 5,921,000	$ 6,626,000
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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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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