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Reporting Segments (Segment Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment operating revenues:      
Gathering and transportation lease revenues $ 12,606 $ 16,257  
Total revenues 20,843 17,490  
Segment operating costs:      
Lease operating expenses 1,909 1,715  
Transportation operating expenses 2,558 2,676  
Production taxes 106 183  
Depreciation, depletion and amortization 5,915 6,429  
Asset impairments 23,247    
Accretion expense 138 133 $ 526
Total operating expenses 38,046 16,520  
Segment other income      
Earnings (losses) from equity investments (1,202) 1,442  
Segment operating income (loss) (14,232) 7,796  
Production      
Segment other income      
Segment operating income (loss) (18,583) (3,101)  
Midstream      
Segment other income      
Segment operating income (loss) 4,351 10,897  
Natural gas sales      
Segment operating revenues:      
Revenues 234 110  
Oil sales      
Segment operating revenues:      
Revenues 7,187 (739)  
Natural gas liquid sales      
Segment operating revenues:      
Revenues 31 179  
Gathering and transportation sales      
Segment operating revenues:      
Revenues $ 785 $ 1,683