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Segment Operating Results - Revenues Derived from Clients by Geographical Areas (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Net Revenues $ 375,404 $ 405,461 $ 1,286,093 $ 1,165,946
United States [Member]        
Segment Reporting Information [Line Items]        
Net Revenues 290,944 305,062 1,023,686 842,814
Europe and Other [Member]        
Segment Reporting Information [Line Items]        
Net Revenues 82,063 94,654 239,226 314,154
Latin America [Member]        
Segment Reporting Information [Line Items]        
Net Revenues $ 2,397 $ 5,745 $ 23,181 $ 8,978