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ACCOUNTING POLICIES (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Long-term Debt $ 394,200   $ 394,200    
Debt Instrument, Fair Value Disclosure $ 422,000   $ 422,000    
Common Stock, Dividends, Per Share, Declared $ 0 $ 0 $ 0 $ 0.005  
Senior Secured Notes 6.50 Percent [Member] [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 7.00%   7.00%    
Long-term Debt $ 400,000   $ 400,000   $ 400,000