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Commitments (Details)
Bcf in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
MMBbls
Bcf
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies      
Contractual obligation, due in next fiscal year $ 132,502    
Contractual obligation, due in second year 103,169    
Contractual obligation, due in third year 88,785    
Contractual obligation, due in fourth year 70,741    
Contractual obligation, due in fifth year 37,334    
Contractual obligation, due after fifth year 24,931    
Contractual obligation 457,462    
Minimum [Member]      
Commitments and Contingencies      
Potential Penalty for not Meeting Minimum Drilling and Completion Requirements 0    
Maximum [Member]      
Commitments and Contingencies      
Potential Penalty for not Meeting Minimum Drilling and Completion Requirements $ 60,000    
Crude oil pipeline commitment [Member]      
Commitments and Contingencies      
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls 29    
Natural gas pipeline commitment [Member]      
Commitments and Contingencies      
Oil and gas delivery commitments, remaining minimum contractual volumes | Bcf 595    
Crude Oil Pipeline Commitment Excluded from Remaining Deficiency Payment Amount [Member]      
Commitments and Contingencies      
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls 18.6    
Drilling rig leasing contracts [Member]      
Commitments and Contingencies      
Contractual obligation $ 86,900    
Early Termination Penalty for Rig Contract Cancellation 45,900    
Expenses related to early contract termination 0 $ 0 $ 8,700
Pipeline transportation commitments [Member]      
Commitments and Contingencies      
Contractual obligation 287,800    
Office space leases [Member]      
Commitments and Contingencies      
Contractual obligation 35,500    
Expenses related to early contract termination 1,300   3,200
Operating leases, rent expense, net of sublease income 4,500 $ 4,800 $ 5,200
Other miscellaneous contracts and leases [Member]      
Commitments and Contingencies      
Contractual obligation 18,300    
Electricity purchase agreement [Member]      
Commitments and Contingencies      
Contractual obligation $ 29,000    
Water pipeline commitment [Member]      
Commitments and Contingencies      
Water delivery commitments, remaining minimum contractual volumes | MMBbls 21