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SEGMENT INFORMATION - Revenue and Long-Lived Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Revenue and Long-lived Assets by Geography      
Revenue $ 303,443 $ 255,311  
Long-lived assets (excluding goodwill and intangible assets) 79,618   $ 70,859
United States      
Revenue and Long-lived Assets by Geography      
Revenue 278,478 233,475  
Long-lived assets (excluding goodwill and intangible assets) 73,949   65,510
All other countries      
Revenue and Long-lived Assets by Geography      
Revenue 24,965 $ 21,836  
Long-lived assets (excluding goodwill and intangible assets) $ 5,669   $ 5,349