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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Acquired Intangible Assets [Line Items]    
Accumulated Amortization $ 159,686 $ 148,644
Net Carrying Amount 552,547 83,989
Gross Carrying Amount 712,233 232,633
Net Carrying Amount 552,547 83,989
Exchange memberships    
Acquired Intangible Assets [Line Items]    
Exchange memberships 5,838 5,838
Purchased technology    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount 110,000 110,000
Accumulated Amortization 110,000 110,000
Net Carrying Amount $ 0 $ 0
Purchased technology | Minimum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years) 1 year 4 months 24 days 1 year 4 months 24 days
Purchased technology | Maximum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years) 2 years 6 months 2 years 6 months
ETF issuer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount $ 950 $ 950
Accumulated Amortization 691 665
Net Carrying Amount $ 259 $ 285
Useful Lives (Years) 9 years 9 years
ETF buyer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount $ 950 $ 950
Accumulated Amortization 691 665
Net Carrying Amount $ 259 $ 285
Useful Lives (Years) 9 years 9 years
Technology    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount $ 153,000 $ 60,000
Accumulated Amortization 36,538 30,185
Net Carrying Amount $ 116,462 $ 29,815
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
Customer relationships    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount $ 432,000 $ 49,000
Accumulated Amortization 10,238 5,905
Net Carrying Amount $ 421,762 $ 43,095
Useful Lives (Years)   12 years
Customer relationships | Minimum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years) 10 years  
Customer relationships | Maximum    
Acquired Intangible Assets [Line Items]    
Useful Lives (Years) 12 years  
Trade name    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount $ 3,600  
Accumulated Amortization 100  
Net Carrying Amount $ 3,500  
Useful Lives (Years) 3 years  
Favorable occupancy leases    
Acquired Intangible Assets [Line Items]    
Gross Carrying Amount $ 5,895 $ 5,895
Accumulated Amortization 1,428 1,224
Net Carrying Amount $ 4,467 $ 4,671
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