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Commitments (Details)
Bcf in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Bcf
MMBbls
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 17, 2021
USD ($)
Commitments and Contingencies        
Contractual obligation, due in 2021 $ 86,776      
Contractual obligation, due in 2022 79,919      
Contractual obligation, due in 2023 45,474      
Contractual obligation, due in 2024 12,455      
Contractual obligation, due in 2025 11,463      
Contractual obligation, due thereafter 13,233      
Contractual obligation $ 249,320      
Crude oil pipeline commitment [Member]        
Commitments and Contingencies        
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls 16      
Natural gas pipeline commitment [Member]        
Commitments and Contingencies        
Oil and gas delivery commitments, remaining minimum contractual volumes | Bcf 257      
Crude Oil Pipeline Commitment Excluded from Remaining Deficiency Payment Amount [Member]        
Commitments and Contingencies        
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls 11.9      
Drilling Rig Leasing Contracts [Member]        
Commitments and Contingencies        
Contractual obligation $ 5,900      
Drilling Rig Leasing Contracts [Member] | Subsequent Event [Member]        
Commitments and Contingencies        
Contractual obligation       $ 19,900
Early Termination Penalty for Rig Contract Cancellation       $ 11,600
PipelineCommitments [Member]        
Commitments and Contingencies        
Contractual obligation 161,600      
Office Space Leases [Member]        
Commitments and Contingencies        
Contractual obligation 22,100      
Operating leases, rent expense, net of sublease income 5,400 $ 5,500 $ 4,500  
Electricity Purchase Agreement [Member]        
Commitments and Contingencies        
Contractual obligation 45,400      
Other miscellaneous contracts and leases [Member]        
Commitments and Contingencies        
Contractual obligation $ 14,300      
Water pipeline commitment [Member]        
Commitments and Contingencies        
Water delivery commitments, remaining minimum contractual volumes | MMBbls 17      
Minimum [Member]        
Commitments and Contingencies        
Potential Penalty for not Meeting Minimum Drilling and Completion Requirements $ 0      
Potential Penalty for not Meeting Minimum Drilling and Completion Counts 0      
Minimum [Member] | Completion Service Commitment [Member]        
Commitments and Contingencies        
Potential Penalty for not Meeting Minimum Completion Service Arrangement Requirements 0      
Minimum [Member] | Sand Sourcing Commitment [Member]        
Commitments and Contingencies        
Potential Penalty for not Meeting Minimum Sand Sourcing Requirements 0      
Maximum [Member]        
Commitments and Contingencies        
Potential Penalty for not Meeting Minimum Drilling and Completion Requirements 26,900      
Potential Penalty for not Meeting Minimum Drilling and Completion Counts 11,500      
Maximum [Member] | Completion Service Commitment [Member]        
Commitments and Contingencies        
Potential Penalty for not Meeting Minimum Completion Service Arrangement Requirements 10,100      
Maximum [Member] | Sand Sourcing Commitment [Member]        
Commitments and Contingencies        
Potential Penalty for not Meeting Minimum Sand Sourcing Requirements $ 10,000