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LONG-TERM DEBT (Narrative) (Details) - Unsecured Debt
Apr. 20, 2021
USD ($)
$ / shares
Mar. 15, 2021
Mar. 14, 2021
USD ($)
2026 Notes      
Debt Instrument [Line Items]      
Debt instrument face amount $ 21,000,000    
Accordion feature, increase limit $ 35,000,000    
Stated interest rate 5.00%    
Conversion ratio (in shares) 166.6667    
Conversion price (in dollars per share) | $ / shares $ 6.00    
Conversion premium, percent 33.00%    
2026 Notes | Debt Instrument Redemption, Change in Control      
Debt Instrument [Line Items]      
Redemption price, percentage 101.00%    
2029 Notes      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 100,000,000
Stated interest rate   7.75% 7.50%
Ratio of indebtedness to net capital threshold   60.00%  
Decrease in ratio of indebtedness to net capital   20.00%  
Increase in interest rate, percent   0.25%