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ACCOUNTING POLICIES (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Long-term Debt $ 395,700       $ 395,700    
Debt Instrument, Fair Value Disclosure $ 319,400       $ 319,400    
Common Stock, Dividends, Per Share, Declared $ 0.005   $ 0.005   $ 0.015 $ 0.015  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ (587)   $ 123      
Senior Secured Notes 6.50 Percent [Member] [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 6.50%       6.50%    
Long-term Debt $ 400,000       $ 400,000   $ 400,000
New Accounting Pronouncement, Early Adoption, Effect [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification             $ 7,400
Accounting Standards Update 2016-02 [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification         600    
Accounting Standards Update 2018-02 [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification         $ 4,900