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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt issuance costs $ 7,723 $ 1,804
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt 0 (13,750)
Long-term debt, net (712,277) (231,946)
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt 0 (13,681)
Long-term debt, net $ (725,700) $ (232,581)