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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Receivables | $ 243 | $ 327
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Remaining lease term | 1 year |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Remaining lease term | 77 years |

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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- Definition Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 310 -URI http://asc.fasb.org/subtopic&trid=2176284 + Details
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