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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% |  |

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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=109500613&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=119400593&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=6877327&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=6876686&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=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + 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=109500613&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=119400593&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=6876686&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=6877327&loc=d3e13212-122682 + Details
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