Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary (Details)

v3.10.0.1
Fair Value Measurements - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]    
Derivative liabilities - current $ (53,263) $ (10,772)
Derivative liabilities - non-current (56,825) (8,008)
Total derivative liabilities (110,088) (18,780)
Commodity derivative liabilities - non-current (56,253) (7,383)
Series B Preferred Stock bifurcated derivative - non-current (572) (625)
Total derivative liabilities (110,088) (18,780)
Level 1    
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]    
Derivative liabilities - current 0 0
Commodity derivative liabilities - non-current 0 0
Series B Preferred Stock bifurcated derivative - non-current 0 0
Total derivative liabilities 0 0
Level 2    
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]    
Derivative liabilities - current (53,263) (10,772)
Commodity derivative liabilities - non-current (56,253) (7,383)
Series B Preferred Stock bifurcated derivative - non-current 0 0
Total derivative liabilities (109,516) (18,155)
Level 3    
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]    
Derivative liabilities - current 0 0
Commodity derivative liabilities - non-current 0 0
Series B Preferred Stock bifurcated derivative - non-current (572) (625)
Total derivative liabilities $ (572) $ (625)