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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

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