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Geographic Information and Business Segments - Revenues by Geographic Area (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 02, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers [Line Items]
Total revenue		$ 362,991	$ 815,053
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Revenues from External Customers [Line Items]
Gain on sale of BondPoint	$ 337,550		337,600
United States
Revenues from External Customers [Line Items]
Total revenue		291,336	743,152
Ireland
Revenues from External Customers [Line Items]
Total revenue		35,675	14,023
United Kingdom
Revenues from External Customers [Line Items]
Total revenue		284	11,600
Singapore
Revenues from External Customers [Line Items]
Total revenue		26,838	46,200
Canada
Revenues from External Customers [Line Items]
Total revenue		5,212	0
Australia
Revenues from External Customers [Line Items]
Total revenue		3,302	0
Others
Revenues from External Customers [Line Items]
Total revenue		$ 344	$ 78

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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- Definition

Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Excluding Transaction Costs

+ References

No definition available.

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