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Current Expected Credit Losses (CECL) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Current expected credit losses reserve | $ 2,600 |  | $ 2,600 |  | $ 2,600 | $ 1,900
Increase (decrease) in expected credit losses reserve | 100 | $ 600 |  | $ 1,400 |  |
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 | 1,100 | 0 | 1,100 | 0 | 1,000 | 800
Increase (decrease) in expected credit losses reserve |  | 200 | 100 |  |  |
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 | $ 100 | $ 800 | $ (100) | $ 1,400 |  |

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- Definition Amount of increase (decrease) in allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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