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Segment and Geographic Information Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets |  |
Revenue | $ 3,100,303 | $ 2,720,764
UNITED STATES |  |
Revenues from External Customers and Long-Lived Assets |  |
Revenue | 1,542,026 | 1,560,027
UNITED KINGDOM |  |
Revenues from External Customers and Long-Lived Assets |  |
Revenue | 412,813 | 430,992
GERMANY |  |
Revenues from External Customers and Long-Lived Assets |  |
Revenue | 386,465 | 803
Other countries |  |
Revenues from External Customers and Long-Lived Assets |  |
Revenue | $ 758,999 | $ 728,942

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- Definition 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 + Details
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