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DEBT - EHP Notes (Details) - EHP Notes - Senior Notes (Unsecured) - USD ($)
Dec. 31, 2020
Oct. 27, 2020
Debt Instrument [Line Items]    
Debt instrument face amount   $ 300,000,000
Interest rate 6.00%  
Through Fourth Anniversary    
Debt Instrument [Line Items]    
Interest rate   6.00%
After Fourth Anniversary    
Debt Instrument [Line Items]    
Interest rate   7.00%
After Fifth Anniversary    
Debt Instrument [Line Items]    
Interest rate   8.00%