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Segment Operating Results - Revenues Derived from Clients by Geographical Areas (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net Revenues | $ 2,063,425 | $ 1,635,517 | $ 1,427,410
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenues | 1,591,883 | 1,199,231 | 1,057,633
Europe and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenues | 438,602 | 422,271 | 337,957
Latin America [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenues | $ 32,940 | $ 14,015 | $ 31,820

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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