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DEBT - Credit Facility (Details)
1 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Remaining borrowing capacity   $ 0 $ 0
PNC bank, national association      
Debt Instrument [Line Items]      
Minimum consolidated coverage ratio 3.5    
Credit agreement | PNC bank, national association      
Debt Instrument [Line Items]      
Minimum required cash and investments held $ 200,000,000    
Maximum consolidated net leverage ratio 3.5    
Line of Credit | PNC bank, national association | Revolving credit facility      
Debt Instrument [Line Items]      
Revolving credit agreement term 5 years    
Senior notes $ 100,000,000    
Increase in aggregate commitment amount $ 200,000,000