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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2022 | Nov. 01, 2021 | Sep. 03, 2019 | Jul. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,326,548 | $ 1,306,892
Institutional Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 991,539 | 971,883
Vining Sparks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Date of acquisition |  | Nov. 01, 2021 |  |  |  |  |
Shares issued as part of the consideration |  | 1.2 |  |  |  |  |
Payments to Acquire Intangible Assets |  | $ 25,400 |  |  |  |  |
Vining Sparks [Member] | Institutional Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 127,000 |  |  |  |  |
ACXIT Capital Partners [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Date of acquisition | Jul. 01, 2022 |  |  |  |  |  |
Payments to Acquire Intangible Assets | $ 5,000 |  |  |  |  |  |
Period of contingent consideration | 1 year |  |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  | 5,200 |
ACXIT Capital Partners [Member] | Institutional Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 17,300 |  |  |  |  |  |
B&F Capital Markets, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Date of acquisition |  |  | Sep. 03, 2019 |  |  |  |
Period of contingent consideration |  |  | 5 years |  |  |  |
Liability for earn-out payments |  |  |  |  |  | 5,200 | 10,500
Mooreland Partners [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Date of acquisition |  |  |  |  | Jul. 01, 2019 |  |
Period of contingent consideration |  |  |  | 3 years |  |  |
Liability for earn-out payments |  |  |  |  |  | $ 5,500 | 18,500
Additional liability for earn-out payments |  |  |  |  |  |  | $ 13,500

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