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SEGMENT INFORMATION - Revenue by Reportable Segment (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
Segment Reporting Information [Line Items]                      
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
North America                      
Segment Reporting Information [Line Items]                      
Revenue                 1,395,428 1,249,892 1,062,171
Europe                      
Segment Reporting Information [Line Items]                      
Revenue                 $ 72,497 $ 76,313 $ 70,070