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Impairment of Natural Gas and Crude Oil Properties (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Wells
Sep. 30, 2019
USD ($)
Impairment of natural gas and crude oil properties [Line Items]        
Oil and Gas, Exploratory Well Drilled, Net Productive, Number | Wells     2  
Delaware Basin Proved Property Impairment $ 753,000      
Delaware Basin Unproved Property Impairment 127,300      
Results of Operations, Impairment of Oil and Gas Properties $ 881,100      
Midstream Asset Divestitures [Member]        
Impairment of natural gas and crude oil properties [Line Items]        
Impairment related to midstream facility infrastructure       $ 26,700
Delaware Basin Assets [Member]        
Impairment of natural gas and crude oil properties [Line Items]        
Results of Operations, Impairment of Oil and Gas Properties     $ 882,300  
Impairment of Leasehold   $ 100   $ 10,300