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DEBT - Issuance of 2025 Senior Notes and Repurchase of 2020 Second Lien Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 16, 2017
Jun. 30, 2017
Dec. 31, 2016
Current and long-term debt      
Aggregate principal amount   $ 962,826 $ 812,826
6.75% senior unsecured notes due 2025      
Current and long-term debt      
Aggregate principal amount $ 850,000 $ 850,000  
Interest rate (as a percent) 6.75% 6.75%  
Net proceeds from issuance $ 833,400    
Debt Issuance Costs      
Gross amount of long-term debt issuance costs   $ 16,600  
6.75% senior unsecured notes due 2025 | Prior to February 15, 2020      
Current and long-term debt      
Redemption price (as a percent)   100.00%  
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed with net proceeds of certain equity offerings   35.00%  
Redemption price of notes utilizing net proceeds of certain equity offerings (as a percent)   106.75%  
Redemption price of notes for change of control (as a percent)   101.00%  
6.75% senior unsecured notes due 2025 | February 15, 2020      
Current and long-term debt      
Redemption price (as a percent) 105.063%    
6.75% senior unsecured notes due 2025 | February 15, 2021      
Current and long-term debt      
Redemption price (as a percent) 103.375%    
6.75% senior unsecured notes due 2025 | February 15, 2022      
Current and long-term debt      
Redemption price (as a percent) 101.688%    
6.75% senior unsecured notes due 2025 | 2023 and thereafter      
Current and long-term debt      
Redemption price (as a percent) 100.00%