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INTANGIBLE ASSETS - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Intangible Assets Disclosure [Line Items]      
Goodwill, Gross $ 49,371   $ 92,361
Goodwill, Impairment (19,100)   (42,990)
Goodwill, Net 30,271   49,371
Finite-lived intangible assets, Accumulated Amortization (72,866)   (70,097)
Total, Gross 347,739   393,558
Total, Impairment (20,100) $ 0 (42,990)
Total, Net 254,773   280,471
Licenses      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 15,847   15,847
Finite-lived intangible assets, Accumulated Amortization (10,400)   (10,287)
Finite-lived intangible assets, Net 5,447   5,560
Trade names      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 43,262   43,986
Finite-lived intangible assets, Accumulated Amortization (17,787)   (17,337)
Finite-lived intangible assets, Net 25,475   26,649
Customer relationships      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 174,561   176,602
Finite-lived intangible assets, Accumulated Amortization (42,693)   (40,605)
Finite-lived intangible assets, Net 131,868   135,997
Other      
Schedule of Intangible Assets Disclosure [Line Items]      
Finite-lived intangible assets, Gross 6,482   6,546
Finite-lived intangible assets, Accumulated Amortization (1,986)   (1,868)
Finite-lived intangible assets, Net 4,496   4,678
Trade names      
Schedule of Intangible Assets Disclosure [Line Items]      
Indefinite-lived intangible assets, Gross 58,216   58,216
Indefinite-lived intangible assets, Impairment (1,000)   0
Indefinite-lived intangible assets, Net $ 57,216   $ 58,216