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Financial Instruments - Credit Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Expected loss rate |  |  | 42.70% |  |
Due from Employees | $ 52,119,000 |  | $ 52,119,000 |  | $ 46,161,000
2020 | 915,000 |  | 915,000 |  |
2019 | 644,000 |  | 644,000 |  |
2018 | 444,000 |  | 444,000 |  |
2017 | 173,000 |  | 173,000 |  |
2016 | 662,000 |  | 662,000 |  |
2016 and prior | 3,491,000 |  | 3,491,000 |  |
Total | 6,329,000 |  | 6,329,000 |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 4,766,000 | $ 3,908,000 | 4,234,000 | $ 3,673,000 |
Additions and other adjustments | (65,000) | (5,000) | 467,000 | 230,000 |
Ending balance | 4,701,000 | $ 3,903,000 | $ 4,701,000 | $ 3,903,000 |
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 | 3,500,000 |  | $ 3,500,000 |  |
Notes Receivable, Under Five Years [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Ending balance | $ 1,200,000 |  | $ 1,200,000 |  |

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