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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Acquired Intangible Assets [Line Items]    
Accumulated Amortization  $ (183,494) $ (219,239)
Gross Carrying Amount 637,993 748,877
Net Carrying Amount  454,499 529,638
Exchange memberships    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Exchange memberships 3,998 4,882
Customer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  486,600 486,600
Accumulated Amortization  (94,299) (46,456)
Net Carrying Amount  $ 392,301 $ 440,144
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  (82,403) (58,203)
Net Carrying Amount  $ 53,597 $ 77,797
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  (2,839) (2,040)
Net Carrying Amount  $ 3,056 $ 3,855
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
Purchased technology    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount    $ 110,000
Accumulated Amortization    (110,000)
Net Carrying Amount    $ 0
Purchased technology | Minimum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)    1 year 4 months 24 days
Purchased technology | Maximum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years)    2 years 6 months
Trade name    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 3,600 $ 3,600
Accumulated Amortization  (2,200) (1,000)
Net Carrying Amount  $ 1,400 $ 2,600
Useful Lives (Years)  3 years 3 years
ETF issuer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 950 $ 950
Accumulated Amortization  (877) (770)
Net Carrying Amount  $ 73 $ 180
Useful Lives (Years)  9 years 9 years
ETF buyer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount  $ 950 $ 950
Accumulated Amortization  (876) (770)
Net Carrying Amount  $ 74 $ 180
Useful Lives (Years)  9 years 9 years