Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Intangible Assets Subject To Amortization) (Details)

v3.20.1
Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 9 years 9 months 6 days  
Gross Carrying Amount $ 184,850 $ 184,845
Accumulated Amortization $ 124,852 111,781
Technology    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 7 years 9 months 60 days  
Gross Carrying Amount $ 25,563 25,563
Accumulated Amortization $ 23,846 22,187
Relationships with financial advisors    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 14 years 3 months 30 days  
Gross Carrying Amount $ 126,122 126,122
Accumulated Amortization $ 70,045 59,584
Vendor relationships    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 7 years  
Gross Carrying Amount $ 3,613 3,613
Accumulated Amortization $ 3,613 3,613
Covenants not-to-compete    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 3 years 10 months  
Gross Carrying Amount $ 6,964 6,964
Accumulated Amortization $ 6,692 6,258
Customer accounts    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 8 years 3 months 18 days  
Gross Carrying Amount $ 2,029 2,029
Accumulated Amortization $ 2,029 2,029
Trade names    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 7 years 8 months 12 days  
Gross Carrying Amount $ 16,921 16,916
Accumulated Amortization $ 14,989 14,472
Relationships with investment banking clients    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 4 years  
Gross Carrying Amount $ 2,586 2,586
Accumulated Amortization $ 2,586 2,586
Leases    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 6 years  
Gross Carrying Amount $ 861 861
Accumulated Amortization $ 861 861
Referral agreement    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 6 years 7 months 6 days  
Gross Carrying Amount $ 124 124
Accumulated Amortization $ 124 124
Other    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life 6 years  
Gross Carrying Amount $ 67 67
Accumulated Amortization $ 67 $ 67