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Property and Equipment - Additional information (Details)
$ in Thousands
3 Months Ended
May 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
$ / Boe
Mar. 31, 2018
USD ($)
$ / Boe
Other information      
Impairment of Oil and Gas Properties   $ 9,653  
Depreciation, Depletion and Amortization   11,794 $ 15,213
Oil and Gas      
Other information      
Qualifying share-based compensation expense     200
Internal costs capitalized   0 895
Impairment of Oil and Gas Properties   9,700 0
Depletion of Oil and Gas Properties   11,680 14,623
Depreciation on other property and equipment   114 590
Depreciation, Depletion and Amortization   $ 11,794 $ 15,213
Depletion expense (per Boe) | $ / Boe   9.81 8.45
Depreciation On Other Property Per Barrel Of Oil Equivalents BOE | $ / Boe   0.10 0.34
Depreciation Depletion And Amortization Per Barrel Of Oil Equivalents BOE | $ / Boe   9.91 8.79
Impairment of Unproved Properties   $ 0 $ 0
Oil and Gas | Discontinued Operations Disposed of by Sale      
Other information      
Proceeds from the sale of oil and gas equipment $ 58,000    
Gain or loss recognized on disposal of oil and gas equipment $ 0    
Other Property and Equipment | Minimum      
Other information      
Estimated useful lives   2 years  
Other Property and Equipment | Maximum      
Other information      
Estimated useful lives   10 years