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Financial Instruments - Credit Losses (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Expected loss rate | 40.90% |
Due from Employees | $ 44,960,000 | $ 43,670,000
2020 | 0 |
2019 | 555,000 |
2018 | 186,000 |
2017 | 769,000 |
2016 | 875,000 |
2015 and prior | 2,933,000 |
Total | 5,318,000 |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance, January 1, 2020 upon adoption of ASU 2016-13 | 3,673,000 |
Additions | 235,000 |
Ending balance, March 31, 2020 | 3,908,000 | $ 3,673,000
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, March 31, 2020 | 2,900,000 |
Notes Receivable, Under Five Years [Member] |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Ending balance, March 31, 2020 | $ 975,000 |

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