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ITG Acquisition - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 01, 2019	Mar. 31, 2019	Dec. 31, 2018
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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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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