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DEBT - Credit Facility (Details)
1 Months Ended
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Remaining borrowing capacity   $ 0 $ 0
PNC Bank, National Association      
Debt Instrument [Line Items]      
Interest coverage ratio, minimum 3.5    
Credit Agreement | PNC Bank, National Association      
Debt Instrument [Line Items]      
Minimum required cash and investments held $ 200,000,000    
Consolidated leverage ratio, maximum 3.5    
Line of credit | PNC Bank, National Association | Revolving credit facility      
Debt Instrument [Line Items]      
Debt instrument term 5 years    
Senior Notes $ 100,000,000    
Aggregate commitment $ 200,000,000