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Debt - Schedule of Outstanding Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Feb. 28, 2017
Dec. 31, 2016
Mar. 15, 2016
Debt Instrument [Line Items]            
Liabilities subject to compromise $ 100   $ 35,000 $ 1,000,336    
Long-Term Debt- Principal Amount 400,000   379,000      
Less: Debt Issuance Costs (8,488)   0      
Long-Term Debt, net $ 391,512   $ 379,000      
Line of credit | RBL Facility            
Debt Instrument [Line Items]            
Variable rate 4.50%   4.80%      
Present value of proven oil and gas reserves under mortgage (percent) 85.00%          
Long-Term Debt- Principal Amount $ 0   $ 379,000      
Senior notes | 6.75% senior notes due November 2020            
Debt Instrument [Line Items]            
Liabilities subject to compromise     $ 0      
Interest rate     6.75%      
Senior notes | 6.375% senior notes due September 2022            
Debt Instrument [Line Items]            
Liabilities subject to compromise     $ 0      
Interest rate     6.375%      
Medium-term notes | 2026 Notes            
Debt Instrument [Line Items]            
Interest rate 7.00% 7.00%        
Long-Term Debt- Principal Amount $ 400,000   $ 0      
Predecessor            
Debt Instrument [Line Items]            
Liabilities subject to compromise         $ 1,000,553  
Predecessor | 6.75% senior notes due November 2020            
Debt Instrument [Line Items]            
Interest rate       6.75%    
Predecessor | 6.375% senior notes due September 2022            
Debt Instrument [Line Items]            
Interest rate           6.375%
Predecessor | Senior notes | 6.75% senior notes due November 2020            
Debt Instrument [Line Items]            
Liabilities subject to compromise         $ 261,100  
Interest rate         6.75%  
Predecessor | Senior notes | 6.375% senior notes due September 2022            
Debt Instrument [Line Items]            
Liabilities subject to compromise         $ 572,700  
Interest rate         6.375%  
Line of credit | RBL Facility            
Debt Instrument [Line Items]            
Variable rate     4.80%      
Line of credit | Predecessor | Pre-Emergence Credit Facility            
Debt Instrument [Line Items]            
Pre-Emergence Credit Facility         $ 891,259  
Variable rate         5.50%