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BASIS OF PRESENTATION - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Accounting Policies [Abstract]    
Number of reportable segments | segment 3  
Cash and cash equivalents $ 529,134 $ 720,662
Increase in allowable interest deduction, COVID-19   179,400
Deferred payment of certain employment taxes, COVID-19   $ 29,300
Refundable payroll tax credit, COVID-19 $ 12,400