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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Fair Value and Outstanding Balances of Borrowings (Details) - Level 2 - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value | Term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 734,728 $ 729,138
Fair Value | Incremental term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 129,319 129,972
Fair Value | Senior Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 296,454 296,083
Outstanding Balance | Term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 735,500 735,500
Outstanding Balance | Incremental term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 123,750 124,375
Outstanding Balance | Senior Unsecured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 285,381 $ 285,381