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Current Expected Credit Losses (CECL) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Current expected credit losses reserve | $ 2,700 |  | $ 2,700 |  | $ 2,600 | $ 1,900
Increase (decrease) in expected credit losses reserve | 100 | $ (400) | 100 | $ 900 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Current expected credit losses reserve | 100 |  | 100 |  |  |
Increase (decrease) in expected credit losses reserve |  |  | 100 |  |  |
Accrued Commissions and Other Receivables, Net |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Current expected credit losses reserve | 1,200 |  | 1,200 |  | 1,000 | 800
Increase (decrease) in expected credit losses reserve | 100 | 300 | 200 | 300 |  |
Accrued Commissions and Other Receivables, Net | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Current expected credit losses reserve | 100 |  | 100 |  |  |
Increase (decrease) in expected credit losses reserve |  |  | 100 |  |  |
Loans, Forgivable Loans and Other Receivables from Employees and Partners, Net |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Current expected credit losses reserve | 1,500 |  | 1,500 |  | $ 1,600 | $ 1,100
Increase (decrease) in expected credit losses reserve | $ 0 | $ (700) | $ 100 | $ 600 |  |

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