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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2019 | Nov. 01, 2019 | Sep. 27, 2019 | Sep. 03, 2019 | Jul. 01, 2019 | Jan. 02, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,181,998 | $ 1,194,074
Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 846,989 | 849,093
GMP Capital Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Date of acquisition | Dec. 06, 2019 |  |  |  |  |  |  |
Payments to Acquire Intangible Assets |  |  |  |  |  |  | 10,700 |
GMP Capital Inc. [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 20,000 |  |  |  |  |  |  |
MainFirst Bank AG [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Date of acquisition |  | Nov. 01, 2019 |  |  |  |  |  |
MainFirst Bank AG [Member] | Tradename, Non-Compete Agreements and Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 800 |  |  |  |  |  |
MainFirst Bank AG [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 15,700 |  |  |  |  |  |
George K. Baum & Company [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Date of acquisition |  |  | Sep. 27, 2019 |  |  |  |  |
George K. Baum & Company [Member] | Customer Relationships and Non-Compete Agreements [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 15,200 |  |  |  |  |
George K. Baum & Company [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 33,300 |  |  |  |  |
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 |  |  |  |  |  |  | $ 16,000 | 20,100
B&F Capital Markets, Inc. [Member] | Tradename, Non-Compete Agreements and Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 18,600 |  |  |  |
B&F Capital Markets, Inc. [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 23,000 |  |  |  |
Mooreland Partners [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  | Jul. 01, 2019 |  | Jul. 01, 2019 |
Period of contingent consideration |  |  |  |  | 3 years |  |  |
Liability for earn-out payments |  |  |  |  |  |  | $ 13,000 | $ 18,400
Mooreland Partners [Member] | Non-Compete Agreements and Backlog [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 5,100 |  |  |
Mooreland Partners [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 45,800 |  |  |
First Empire Holding Corp. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  | Jan. 02, 2019 |  |
First Empire Holding Corp. [Member] | Tradename and Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  | $ 7,800 |  |
First Empire Holding Corp. [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 14,900 |  |

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