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Notes and Other Receivables - Allowance for credit loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 0 |  |
Impact of adoption ASC 326 | 0 | $ 0 |
Provision for credit losses | (687) | 0 | $ 0
Ending balance | 751 | 0 |
Mezzanine Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 0 |  |
Impact of adoption ASC 326 | 751 | 0 |
Provision for credit losses | 604 |  |
Ending balance | 751 | 0 |
Bridge Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 0 |  |
Impact of adoption ASC 326 | 0 | 0 |
Provision for credit losses | (43) |  |
Ending balance | 0 | 0 |
Mezzanine and Bridge Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 0 |  |
Impact of adoption ASC 326 | 751 | 0 |
Provision for credit losses | 561 |  |
Ending balance | 751 | 0 |
Cumulative Effect, Period of Adoption, Adjustment | Mezzanine Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 147 |  |
Impact of adoption ASC 326 | 147 | 147 |
Ending balance |  | 147 |
Cumulative Effect, Period of Adoption, Adjustment | Bridge Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 43 |  |
Impact of adoption ASC 326 | 43 | 43 |
Ending balance |  | 43 |
Cumulative Effect, Period of Adoption, Adjustment | Mezzanine and Bridge Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 190 |  |
Impact of adoption ASC 326 | $ 190 | 190 |
Ending balance |  | $ 190 |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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