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SEGMENT AND GEOGRAPHIC INFORMATION - Total Revenue by Major Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Total Revenues $ 383,645 $ 366,190 $ 743,335 $ 723,272
United States        
Segment Reporting Information [Line Items]        
Total Revenues 273,390 259,711 530,116 508,639
Europe        
Segment Reporting Information [Line Items]        
Total Revenues 50,871 51,405 99,511 103,178
Asia Pacific        
Segment Reporting Information [Line Items]        
Total Revenues 37,031 35,497 72,731 71,282
Rest of World        
Segment Reporting Information [Line Items]        
Total Revenues $ 22,353 $ 19,577 $ 40,977 $ 40,173