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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% |

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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