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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions | Aug. 01, 2023 | Mar. 01, 2023 | Jul. 01, 2022 | Nov. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,388,243 | $ 1,326,548
Institutional Group [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,053,234 | 991,539
Sierra Pacific Securities, LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition | Aug. 01, 2023 |  |  |  |  |
Payments to Acquire Intangible Assets | $ 18,100 |  |  |  |  |
Sierra Pacific Securities, LLC [Member] | Institutional Group [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 6,600 |  |  |  |  |
Torreya Partners, LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition |  | Mar. 01, 2023 |  |  |  |
Payments to Acquire Intangible Assets |  | $ 5,300 |  |  |  |
Torreya Partners, LLC [Member] | Institutional Group [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 55,100 |  |  |  |
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 |  |  |
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 |  |

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