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Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 17, 2017
May 31, 2018
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-term Purchase Commitment [Line Items]              
Term of leases       5 years      
Rent expense, including fees for operating expenses and consumption of electricity       $ 2.7 $ 2.6 $ 2.9  
Minimum outstanding commitments       24.3      
Field Compression and Amine Gas Treatment              
Long-term Purchase Commitment [Line Items]              
Long-term purchase commitment       24.9      
Payment for long-term purchase commitment       21.3      
Long-term purchase commitment, remaining obligation       3.6      
Drilling Rig Commitments              
Long-term Purchase Commitment [Line Items]              
Maximum termination outstanding obligations of contracts       28.4      
Loving County System Agreement              
Long-term Purchase Commitment [Line Items]              
Supply agreement, term             15 years
Total deficiency fee estimate       7.6      
Corporate Joint Venture | San Mateo Midstream              
Long-term Purchase Commitment [Line Items]              
Contractual obligation       221.1      
Corporate Joint Venture | San Mateo Midstream | Rustler Breaks and Wolf Asset Area              
Long-term Purchase Commitment [Line Items]              
Contractual obligation, term 15 years            
Corporate Joint Venture | San Mateo Midstream | Rustler Breaks Asset Area              
Long-term Purchase Commitment [Line Items]              
Contractual obligation, term 15 years            
Natural Gas Transportation Agreement | Eddy County              
Long-term Purchase Commitment [Line Items]              
Supply agreement, term         18 years    
Contractual obligation       $ 20.1      
Natural Gas Transportation and Fractionation Agreement | Eddy County              
Long-term Purchase Commitment [Line Items]              
Supply agreement, term       7 years      
Contractual obligation       $ 132.3      
16-Year Fixed Fee Natural Gas Transportation Agreement | Eddy County              
Long-term Purchase Commitment [Line Items]              
Supply agreement, term     16 years        
Contractual obligation       56.8      
10-Year Fixed Fee Natural Gas Transportation Agreement | Eddy County              
Long-term Purchase Commitment [Line Items]              
Supply agreement, term   10 years          
Contractual obligation       200.6      
Natural Gas, Gathering, Transportation, Marketing and Processing | Loving County System Agreement              
Long-term Purchase Commitment [Line Items]              
Processing and gathering fees       15.4 $ 14.4    
Natural Gas, Gathering, Transportation, Marketing and Processing | Eddy County              
Long-term Purchase Commitment [Line Items]              
Processing and gathering fees       3.3 $ 0.2    
Natural Gas Transportation Agreement | Eddy County              
Long-term Purchase Commitment [Line Items]              
Contractual obligation       2.7      
Natural Gas Transportation Agreement | Transportation Fees | Eddy County              
Long-term Purchase Commitment [Line Items]              
Processing and gathering fees       $ 1.9