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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
May 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Long-term Debt $ 1,654,158   $ 1,601,836
2025 Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 725,000  
Debt instrument, interest rate 7.30%    
Proceeds from Debt, Net of Issuance Costs $ 712,586    
Debt Instrument, Redemption Price, Percentage 100.00%    
2020 Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate 8.30%    
2023 Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate 7.00%