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Mortgages Payable - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) mortgage property | Dec. 31, 2018 USD ($) mortgage | Dec. 31, 2017 USD ($)
Debt |  |  |
Principal payments on mortgages payable | $ 20,723 | $ 21,905 | $ 139,725
Number of mortgages assumed | mortgage | 2 | 0 |
Mortgage loans assumed | $ 130,800 |  |
Number of properties related to mortgages assumed | property | 33 |  |
Mortgages Payable |  |  |
Debt |  |  |
Principal payments on mortgages payable | $ 20,700 | $ 21,900 |
Deferred financing costs | 1,300 | 183 |
Unamortized premium balance | 3,000 |  |
Mortgages Payable | Mortgages repaid in full |  |  |
Debt |  |  |
Principal payments on mortgages payable | $ 15,800 | $ 17,000 |
Number of mortgages repaid | mortgage | 1 | 2 |

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- Definition Number Of Mortgages Assumed During Period + References No definition available. + Details
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- Definition Number Of Properties Related To Mortgages Assumed During Period + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt discount (premium). + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28567-108399 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + 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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