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INTANGIBLE ASSETS - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Intangible Assets Disclosure [Line Items]          
Goodwill, Gross $ 30,271   $ 30,271   $ 49,371
Goodwill, Impairment         (19,100)
Goodwill, Net 30,271   30,271   30,271
Finite-lived intangible assets, Accumulated Amortization (100,422)   (100,422)   (88,106)
Total, Gross 331,436   331,436   352,231
Total, Impairment 0 $ 0 0 $ (20,100) (20,100)
Total, Net 231,014   231,014   244,025
Licenses          
Schedule of Intangible Assets Disclosure [Line Items]          
Finite-lived intangible assets, Gross 15,847   15,847   15,847
Finite-lived intangible assets, Accumulated Amortization (11,084)   (11,084)   (10,742)
Finite-lived intangible assets, Net 4,763   4,763   5,105
Trade names          
Schedule of Intangible Assets Disclosure [Line Items]          
Finite-lived intangible assets, Gross 51,851   51,851   52,030
Finite-lived intangible assets, Accumulated Amortization (23,146)   (23,146)   (20,874)
Finite-lived intangible assets, Net 28,705   28,705   31,156
Customer relationships          
Schedule of Intangible Assets Disclosure [Line Items]          
Finite-lived intangible assets, Gross 177,300   177,300   177,801
Finite-lived intangible assets, Accumulated Amortization (63,270)   (63,270)   (54,008)
Finite-lived intangible assets, Net 114,030   114,030   123,793
Other          
Schedule of Intangible Assets Disclosure [Line Items]          
Finite-lived intangible assets, Gross 6,567   6,567   6,582
Finite-lived intangible assets, Accumulated Amortization (2,922)   (2,922)   (2,482)
Finite-lived intangible assets, Net 3,645   3,645   4,100
Trade names          
Schedule of Intangible Assets Disclosure [Line Items]          
Indefinite-lived intangible assets, Gross 49,600   49,600   50,600
Indefinite-lived intangible assets, Impairment         (1,000)
Indefinite-lived intangible assets, Net $ 49,600   $ 49,600   $ 49,600