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SEGMENT AND GEOGRAPHICAL REPORTING - Revenues by Geographical Location (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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                              
Total revenue $ 232,700 $ 220,200 $ 251,400 $ 301,000 $ 295,500 $ 327,200 $ 333,300 $ 311,200 $ 311,000 $ 308,000 $ 311,200 $ 285,900 $ 1,005,266 $ 1,267,189 $ 1,216,197
Reportable Geographical Components | United States                              
Segment Reporting Information [Line Items]                              
Total revenue                         931,000 1,165,000 1,110,000
Reportable Geographical Components | Canada                              
Segment Reporting Information [Line Items]                              
Total revenue                         74,000 102,000 106,000
Reportable Geographical Components | Other                              
Segment Reporting Information [Line Items]                              
Total revenue                         $ 0 $ 0 $ 0