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ACCOUNTING POLICIES (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Organization And Accounting Policies [Line Items]          
Senior Notes $ 395,400   $ 395,400    
Long-term Debt 503,608   503,608   $ 506,665
Debt Instrument, Fair Value Disclosure $ 348,000   $ 348,000    
Common Stock, Dividends, Per Share, Declared $ 0.005 $ 0.005 $ 0.010 $ 0.010  
Debt Instrument, Unamortized Discount (Premium), Net $ 4,623   $ 4,623   4,961
Senior Secured Notes 6.875 Percent [Member]          
Organization And Accounting Policies [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.875%   6.875%    
Senior Notes $ 400,000   $ 400,000   400,000
Long-term Debt $ 395,377   $ 395,377   395,360
5.625% convertible senior subordinated notes [Member]          
Organization And Accounting Policies [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.625%   5.625%    
Long-term Debt $ 59,994   $ 59,994   $ 59,840