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SEGMENT INFORMATION - Revenue and Long-Lived Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue and Long-lived Assets by Geography                      
Revenue $ 359,301 $ 389,913 $ 375,061 $ 343,650 $ 321,508 $ 357,358 $ 343,896 $ 303,443 $ 1,467,925 $ 1,326,205 $ 1,132,241
Long-lived assets (excluding goodwill and intangible assets) 108,842       103,361       108,842 103,361  
United States                      
Revenue and Long-lived Assets by Geography                      
Revenue                 1,379,236 1,234,755 $ 1,050,641
Long-lived assets (excluding goodwill and intangible assets) 97,841       95,822       $ 97,841 $ 95,822  
United States | Geographic Concentration Risk                      
Revenue and Long-lived Assets by Geography                      
Revenue concentration risk percentage (greater than)                 95.00%    
United States | Revenue Benchmark | Geographic Concentration Risk                      
Revenue and Long-lived Assets by Geography                      
Revenue concentration risk percentage (greater than)                 10.00% 10.00% 10.00%
All other countries                      
Revenue and Long-lived Assets by Geography                      
Revenue                 $ 88,689 $ 91,450 $ 81,600
Long-lived assets (excluding goodwill and intangible assets) $ 11,001       $ 7,539       $ 11,001 $ 7,539