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Fresh-Start Accounting - Other Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Feb. 28, 2017
Reorganization Items [Line Items]      
Natural gas plants and pipelines     $ 91,427
Land     8,262
Furniture and office equipment     5,040
Buildings and leasehold improvements     2,740
Total other property and equipment     108,803
Other property and equipment $ 135,117 $ 119,710 108,803
Less accumulated depreciation     0
Less accumulated depreciation (25,462) (15,778) 0
Total other property and equipment, net     108,803
Total other property and equipment, net 109,655 103,932 108,803
Natural gas plants and pipelines      
Reorganization Items [Line Items]      
Other property and equipment 94,619 86,562  
Land      
Reorganization Items [Line Items]      
Other property and equipment 7,544 8,073  
Furniture and office equipment      
Reorganization Items [Line Items]      
Other property and equipment 20,078 14,964  
Buildings and leasehold improvements      
Reorganization Items [Line Items]      
Other property and equipment 3,752 3,359  
Vehicles      
Reorganization Items [Line Items]      
Vehicles     1,156
Other property and equipment $ 9,124 $ 6,753  
Drilling and other equipment      
Reorganization Items [Line Items]      
Drilling and other equipment     178
Previously Reported      
Reorganization Items [Line Items]      
Other property and equipment     124,379
Less accumulated depreciation     (22,107)
Total other property and equipment, net     102,273
Previously Reported | Natural gas plants and pipelines      
Reorganization Items [Line Items]      
Other property and equipment     109,675
Previously Reported | Land      
Reorganization Items [Line Items]      
Other property and equipment     201
Previously Reported | Furniture and office equipment      
Reorganization Items [Line Items]      
Other property and equipment     3,879
Previously Reported | Buildings and leasehold improvements      
Reorganization Items [Line Items]      
Other property and equipment     5,884
Previously Reported | Vehicles      
Reorganization Items [Line Items]      
Other property and equipment     4,542
Previously Reported | Drilling and other equipment      
Reorganization Items [Line Items]      
Other property and equipment     $ 198