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SEGMENT INFORMATION - Schedule of Geographic Information About Revenue and Long-Lived Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Revenue and long-lived assets by geography      
Revenue $ 995,075 $ 760,833  
Property and equipment, net of accumulated depreciation and amortization 301,865   $ 315,170
United States      
Revenue and long-lived assets by geography      
Revenue 657,580 548,598  
Property and equipment, net of accumulated depreciation and amortization 272,881   286,541
All other countries      
Revenue and long-lived assets by geography      
Revenue 337,495 $ 212,235  
Property and equipment, net of accumulated depreciation and amortization $ 28,984   $ 28,629