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Summary of Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Revenue Recognition |  |  |
Maximum period over which loan is to be considered as non-performing | 60 days |  |
Variable cash rental income | $ | $ 16,462,000 |  |
Variable cash rental income previous | $ | $ 464,000 | $ 470,000 | $ 457,000
Maximum period over which a lease is to be considered as non-performing | 60 days |  |
Minimum |  |  |
Revenue Recognition |  |  |
Methods used for calculation of annual increases over the rents of the prior year | item | 1 |  |
Specified annual increase over the prior year's rent (as a percent) | 2.00% |  |
Maximum |  |  |
Revenue Recognition |  |  |
Methods used for calculation of annual increases over the rents of the prior year | item | 4 |  |
Specified annual increase over the prior year's rent (as a percent) | 3.00% |  |

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- Definition Represents the maximum period after which the amount of lease payments due becomes delinquent. + References No definition available. + Details
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- Definition Represents the maximum period after which the amount of principal due on mortgage loans becomes delinquent. + References No definition available. + Details
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- Definition Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981 + Details
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- Definition Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
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