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Financial Instruments - Credit Losses (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Expected loss rate |  | 42.00% |
Due from Employees | $ 44,723,000 | $ 44,723,000 | $ 43,670,000
2020 | 404,000 | 404,000 |
2019 | 476,000 | 476,000 |
2018 | 181,000 | 181,000 |
2017 | 748,000 | 748,000 |
2016 | 651,000 | 651,000 |
2015 and prior | 3,157,000 | 3,157,000 |
Total | 5,617,000 | 5,617,000 |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,903,000 | 3,673,000 |
Additions and other adjustments | 287,000 | 517,000 |
Ending balance | 4,190,000 | $ 4,190,000 |
Minimum [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Service Period |  | 3 years |
Maximum [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Service Period |  | 10 years |
Notes Receivable, Five Years and Older [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Ending balance | 3,200,000 | $ 3,200,000 |
Notes Receivable, Under Five Years [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Ending balance | $ 1,000,000.0 | $ 1,000,000.0 |

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