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DEBT (Senior and Subordinated Notes) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Debt instrument covenant limitation on total borrowings percentage of total assets 70.00%   70.00%    
Debt instrument covenant net worth $ 600,000   $ 600,000    
Recapitalization costs 0 $ 0 232 $ 30  
Extinguishment of debt     382,699 0  
Vessel Operations [Member]          
Debt Instrument [Line Items]          
Recapitalization costs $ 0 $ 0 $ 232 $ 30  
10.75% Subordinated Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 10.75%   10.75%    
Senior Notes [Member] | 8.5% Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 8.50%   8.50%   8.50%
Subordinated Debt [Member] | 8.5% Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 8.50%   8.50%    
Subordinated Debt [Member] | 10.75% Subordinated Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 10.75%   10.75%   10.75%