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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Acquired Intangible Assets [Line Items]    
Accumulated Amortization  $ (404,829) $ (381,973)
Gross Carrying Amount 631,648 639,493
Net Carrying Amount  226,819 257,520
Exchange memberships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  3,998 3,998
Other    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  1,125 1,500
Customer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  479,130 486,600
Accumulated Amortization  (257,767) (237,829)
Net Carrying Amount  $ 221,363 $ 248,771
Customer relationships | Minimum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)  10 years 10 years
Customer relationships | Maximum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)  12 years 12 years
Technology    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 136,000 $ 136,000
Accumulated Amortization  (136,000) (133,467)
Net Carrying Amount  $ 0 $ 2,533
Technology | Minimum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)  1 year 1 year
Technology | Maximum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)  6 years 6 years
Favorable occupancy leases    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 5,895 $ 5,895
Accumulated Amortization  (5,562) (5,177)
Net Carrying Amount  $ 333 $ 718
Favorable occupancy leases | Minimum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)  3 years 3 years
Favorable occupancy leases | Maximum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)  15 years 15 years
Trade name    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 3,600 $ 3,600
Accumulated Amortization  (3,600) (3,600)
Net Carrying Amount  $ 0 $ 0
Useful Lives (Years)  3 years 3 years
ETF issuer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 950 $ 950
Accumulated Amortization  (950) (950)
Net Carrying Amount  $ 0 $ 0
Useful Lives (Years)  9 years 9 years
ETF buyer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 950 $ 950
Accumulated Amortization  (950) (950)
Net Carrying Amount  $ 0 $ 0
Useful Lives (Years)  9 years 9 years