Quarterly report pursuant to Section 13 or 15(d)

Risk Management and Derivative Instruments- Balance Sheet Presentation (Details)

v3.10.0.1
Risk Management and Derivative Instruments- Balance Sheet Presentation (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Total derivative financial instruments - current liabilities $ (13,210) $ (3,433)
Total derivative financial instruments - noncurrent liabilities (4,361) (562)
Commodity Derivatives | Not designated as Hedging Instrument    
Total derivative financial instruments - current assets   762
Total derivative financial instruments - current liabilities (13,210) (3,433)
Total derivative financial instruments - noncurrent liabilities (4,361) (562)
Total derivative fair value at period end (17,571) (3,233)
Derivative assets:    
Gross Recognized Assets 1,977 4,384
Gross Amounts Offset, Assets (1,977) (3,622)
Net Recognized Fair Value Assets   762
Derivative liabilities:    
Gross Recognized Liabilities (19,548) (7,617)
Gross Amounts Offset, Liabilities 1,977 3,622
Net Recognized Fair Value Liabilities (17,571) (3,995)
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument    
Derivative assets:    
Gross Recognized Assets 901 3,479
Gross Amounts Offset, Assets (901) (2,717)
Net Recognized Fair Value Assets   762
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Leasehold interest swap | Natural gas    
Total derivative financial instruments - current assets   821
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil    
Total derivative financial instruments - current assets   (760)
Current Assets | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Natural gas    
Total derivative financial instruments - current assets   701
Non-Current Assets | Commodity Derivatives | Not designated as Hedging Instrument    
Derivative assets:    
Gross Recognized Assets 1,076 905
Gross Amounts Offset, Assets (1,076) (905)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument    
Derivative liabilities:    
Gross Recognized Liabilities (14,111) (6,150)
Gross Amounts Offset, Liabilities 901 2,717
Net Recognized Fair Value Liabilities (13,210) (3,433)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Leasehold interest swap | Oil    
Total derivative financial instruments - current liabilities (6,753) (3,679)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Leasehold interest swap | Natural gas    
Total derivative financial instruments - current liabilities (292)  
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil    
Total derivative financial instruments - current liabilities (6,241) (370)
Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Natural gas    
Total derivative financial instruments - current liabilities 76 616
Non-Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument    
Derivative liabilities:    
Gross Recognized Liabilities (5,437) (1,467)
Gross Amounts Offset, Liabilities 1,076 905
Net Recognized Fair Value Liabilities (4,361) (562)
Non-Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Leasehold interest swap | Oil    
Total derivative financial instruments - noncurrent liabilities (357) (523)
Non-Current Liabilities | Commodity Derivatives | Not designated as Hedging Instrument | Collars | Oil    
Total derivative financial instruments - noncurrent liabilities $ (4,004) $ (39)