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Acquisition of KCG Holdings, Inc. - Intangible assets (Details) - USD ($) | Jul. 20, 2017 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets |  | $ 104,387,000 | $ 111,224,000
Goodwill |  | 836,583,000 | 844,883,000
Deferred tax assets |  | 123,289,000 | 125,760,000
Customer relationships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets |  | 46,157,000 | 47,178,000
Favorable leases |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets |  | 5,283,000 | 5,487,000
KCG |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 174,995,000 |  |
Goodwill | 128,286,000 |  |
Total | 303,281,000 |  |
Goodwill deductible for tax purposes | 0 |  |
Deferred tax assets | 23,900,000 |  |
KCG | Technology |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | 67,700,000 |  |
KCG | Customer relationships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | 94,000,000 |  |
KCG | Trade names |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 1,000,000 |  |
Amortization Years | 10 years |  |
KCG | Favorable leases |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 5,895,000 |  |
KCG | Exchange memberships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 6,400,000 |  |
Minimum | KCG | Technology |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Amortization Years | 1 year |  |
Minimum | KCG | Customer relationships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Amortization Years | 13 years |  |
Minimum | KCG | Favorable leases |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Amortization Years | 2 years |  |
Maximum | KCG | Technology |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Amortization Years | 6 years |  |
Maximum | KCG | Customer relationships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Amortization Years | 17 years |  |
Maximum | KCG | Favorable leases |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Amortization Years | 15 years |  |
Market Making |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Goodwill | $ 96,200,000 | $ 755,292,000 | $ 755,292,000
Technology and Execution Services |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Goodwill | $ 32,100,000 |  |

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