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Long-Term Debt - Narrative (Details) - Successor
shares in Millions
1 Months Ended 3 Months Ended 4 Months Ended 7 Months Ended 12 Months Ended
Feb. 10, 2017
USD ($)
shares
Oct. 01, 2016
USD ($)
shares
Oct. 01, 2016
USD ($)
Feb. 28, 2017
shares
Feb. 09, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Feb. 09, 2017
shares
May 11, 2017
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                  
Face value of long-term debt           $ 305,308,000     $ 37,502,000
Common stock issued for debt           13,001,000     268,779,000
Long-term debt maturing in 2021                 36,300,000
Senior credit facility                  
Debt Instrument [Line Items]                  
Letters of credit outstanding                 6,700,000
Secured Debt | Building Note                  
Debt Instrument [Line Items]                  
Face value of long-term debt           36,528,000     37,502,000
Face amount of debt instrument   $ 35,000,000.0 $ 35,000,000.0            
Fair value of debt   36,600,000 $ 36,600,000            
Term of paid in kind interest payments               90 days  
Proceeds from issuance of debt   $ 26,800,000              
Secured Debt | Building Note | October 5, 2016 through October 4, 2017                  
Debt Instrument [Line Items]                  
Annual interest rate   6.00% 6.00%            
Secured Debt | Building Note | October 5, 2017 through October 4, 2018                  
Debt Instrument [Line Items]                  
Annual interest rate   8.00% 8.00%            
Secured Debt | Building Note | October 5, 2018 and thereafter                  
Debt Instrument [Line Items]                  
Annual interest rate   10.00% 10.00%            
Convertible Debt | Convertible Notes                  
Debt Instrument [Line Items]                  
Face value of long-term debt           268,780,000     0
Face amount of debt instrument   $ 281,800,000 $ 281,800,000            
Fair value of debt   445,700,000 445,700,000            
Premium on debt instrument   $ 163,900,000 $ 163,900,000            
Conversion ratio   0.05330841              
Common stock issued for debt         $ 5,100,000 $ 13,000,000.0      
Common stock issued for debt (in shares) | shares 14.1 15.0   14.1 0.3 0.7 1.0    
Debt conversion, original debt, amount $ 263,700,000                
Annual interest rate   0.00% 0.00%            
Revolving Credit Facility | New First Lien Exit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   $ 425,000,000.0 $ 425,000,000.0            
Line of credit facility, unused capacity, commitment fee percentage     0.50%            
Cash collateral account 50,000,000.0                
Face value of long-term debt           $ 0     0
Revolving Credit Facility | New First Lien Exit Facility | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     3.75%            
Revolving Credit Facility | New First Lien Exit Facility | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     4.75%            
Variable rate floor     1.00%            
Revolving Credit Facility | Amended New Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 600,000,000.0                
Line of credit facility, current borrowing capacity $ 425,000,000.0                
Line of credit facility, unused capacity, commitment fee percentage 0.50%                
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination 95.00%                
Ratio of Indebtedness to Assets 3.50                
Minimum consolidated interest coverage ratio 2.25                
Aggregate amount of default trigger $ 25,000,000.0                
Legal judgment default trigger $ 25,000,000.0                
Face value of long-term debt                 $ 0
Revolving Credit Facility | Amended New Credit Facility | Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.00%                
Revolving Credit Facility | Amended New Credit Facility | Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 3.00%                
Revolving Credit Facility | Amended New Credit Facility | LIBOR | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 3.00%                
Revolving Credit Facility | Amended New Credit Facility | LIBOR | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 4.00%