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ITG Acquisition - Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets |  | $ 552,547 | $ 83,989
Goodwill |  | 1,193,697 | 836,583
Customer relationships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets |  | 421,762 | $ 43,095
Trade names |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets |  | $ 3,500 |
ITG |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 479,600 |  |
Goodwill | 357,334 |  |
Total | 836,934 |  |
ITG | Technology |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 93,000 |  |
Amortization Years | 5 years |  |
ITG | Customer relationships |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 383,000 |  |
Amortization Years | 10 years |  |
ITG | Trade names |  |  |
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill |  |  |
Intangible assets | $ 3,600 |  |
Amortization Years | 3 years |  |

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