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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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