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LONG-TERM DEBT LIABILITIES - Senior Unsecured Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2011
Debt Instrument [Line Items]      
Senior Notes $ 416,584 $ 0  
Debt Instrument, Interest Rate, Stated Percentage 7.25%    
Senior Unsecured Debt      
Debt Instrument [Line Items]      
Senior Notes     $ 220,000
Debt Instrument, Interest Rate, Stated Percentage     10.50%
Senior Unsecured Debt | On or After November 1, 2019      
Debt Instrument [Line Items]      
Redemption of the principal amount 105.438%    
Senior Unsecured Debt | On or after November 1, 2020      
Debt Instrument [Line Items]      
Redemption of the principal amount 103.625%    
Senior Unsecured Debt | On or after November 1, 2021      
Debt Instrument [Line Items]      
Redemption of the principal amount 101.813%    
Senior Unsecured Debt | On or after November 1, 2022      
Debt Instrument [Line Items]      
Redemption of the principal amount 100.00%