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INTANGIBLE ASSETS - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Intangible Assets Disclosure [Line Items]      
Goodwill, Gross $ 30,271   $ 49,371
Goodwill, Impairment     (19,100)
Goodwill, Net 30,271   30,271
Finite-lived intangible assets, Accumulated Amortization (92,584)   (88,106)
Total, Gross 332,511   352,231
Total, Impairment 0 $ (20,100) (20,100)
Total, Net 239,927   244,025
Licenses      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 15,847   15,847
Finite-lived intangible assets, Accumulated Amortization (10,856)   (10,742)
Finite-lived intangible assets, Net 4,991   5,105
Trade names      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 52,126   52,030
Finite-lived intangible assets, Accumulated Amortization (21,720)   (20,874)
Finite-lived intangible assets, Net 30,406   31,156
Customer relationships      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 178,075   177,801
Finite-lived intangible assets, Accumulated Amortization (57,371)   (54,008)
Finite-lived intangible assets, Net 120,704   123,793
Other      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 6,592   6,582
Finite-lived intangible assets, Accumulated Amortization (2,637)   (2,482)
Finite-lived intangible assets, Net 3,955   4,100
Trade names      
Schedule of Intangible Assets Disclosure [Line Items]      
Indefinite-lived intangible assets, Gross 49,600   50,600
Indefinite-lived intangible assets, Impairment     (1,000)
Indefinite-lived intangible assets, Net $ 49,600   $ 49,600