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Segment and Geographic Information Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets
Revenue	$ 2,720,764	$ 2,342,843
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Revenue	1,560,027	1,417,040
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Revenue	430,992	382,652
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue	$ 729,745	$ 543,151

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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