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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | $ 891,586 |  |
Interest |  |  |  |  |  |  |  |  |  | 52,484 | $ 48,498 | $ 47,649
Principal transactions, net |  |  |  |  |  |  |  |  |  | (14,461) | (23,273) | (20,481)
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | (377) |  |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | (66,568) |  |
Revenue |  | $ (243,254) | $ (237,814) | $ (242,556) | $ (234,530) | $ (264,973) | $ (226,220) | $ (215,884) | $ (213,261) | (958,154) | (920,338) | (857,779)
Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 286,211 |  |
Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 43,457 |  |
Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 314,349 |  |
Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 69,758 |  |
Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 45,595 |  |
Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 116,052 |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 16,164 |  |
Private Client Division |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 584,236 |  |
Interest |  |  |  |  |  |  |  |  |  | 37,581 |  |
Principal transactions, net |  |  |  |  |  |  |  |  |  | 1,125 |  |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 2,821 |  |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | (33,635) |  |
Revenue | [1] |  |  |  |  |  |  |  |  | (617,871) | (592,753) | (504,192)
Private Client Division | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 154,167 |  |
Private Client Division | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 42,514 |  |
Private Client Division | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 243,474 |  |
Private Client Division | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 13,284 |  |
Private Client Division | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Private Client Division | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 116,052 |  |
Private Client Division | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 14,745 |  |
Asset Management Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 71,696 |  |
Interest |  |  |  |  |  |  |  |  |  | 0 |  |
Principal transactions, net |  |  |  |  |  |  |  |  |  | 0 |  |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | 0 |  |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | 0 |  |
Revenue | [1] |  |  |  |  |  |  |  |  | (71,696) | (89,896) | (92,852)
Asset Management Segment [Member] | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Asset Management Segment [Member] | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 908 |  |
Asset Management Segment [Member] | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 70,775 |  |
Asset Management Segment [Member] | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Asset Management Segment [Member] | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Asset Management Segment [Member] | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Asset Management Segment [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 13 |  |
Capital markets |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 235,158 |  |
Interest |  |  |  |  |  |  |  |  |  | 13,739 |  |
Principal transactions, net |  |  |  |  |  |  |  |  |  | (23,378) |  |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | (444) |  |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | (37,561) |  |
Revenue |  |  |  |  |  |  |  |  |  | (272,719) | (231,632) | (254,933)
Capital markets | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 131,955 |  |
Capital markets | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 13 |  |
Capital markets | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 67 |  |
Capital markets | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 56,474 |  |
Capital markets | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 45,595 |  |
Capital markets | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Capital markets | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 1,054 |  |
Corporate/Other |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 496 |  |
Interest |  |  |  |  |  |  |  |  |  | 1,164 |  |
Principal transactions, net |  |  |  |  |  |  |  |  |  | (7,792) |  |
Revenues, Excluding Revenue From Contract With Customers, Other |  |  |  |  |  |  |  |  |  | (2,000) |  |
Revenues, Excluding Revenue From Contract With Customers |  |  |  |  |  |  |  |  |  | (4,628) |  |
Revenue |  |  |  |  |  |  |  |  |  | (4,132) | $ (6,057) | $ (5,802)
Corporate/Other | Commissions From Sales And Trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 89 |  |
Corporate/Other | Mutual Fund Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 22 |  |
Corporate/Other | Advisory Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 33 |  |
Corporate/Other | Investment Banking, Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Corporate/Other | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Corporate/Other | Investment Banking, Advisory [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Corporate/Other | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | $ 352 |  |
[1] | Clients investing in the OAM advisory program are charged fees based on the value of AUM. Advisory fees were allocated 22.5% to the Asset Management and 77.5% to the Private Client segments. Starting January 1, 2017, the Company determined it was appropriate to change the allocation to 10.0% to the Asset Management and 90.0% to the Private Client segments due to changes in the mix of the business over time and costs associated with it.

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