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Properties and Equipment (Tables)
 9 Months Ended
Sep. 30, 2020
Oil and Gas Property [Abstract]  
Property, Plant and Equipment
The following table presents the components of properties and equipment, net of accumulated depreciation, depletion and amortization ("DD&A"):
September 30, 2020December 31, 2019
(in thousands)
Properties and equipment, net:
Crude oil and natural gas properties
Proved$7,389,676 $6,241,780 
Unproved381,428 403,379 
Total crude oil and natural gas properties7,771,104 6,645,159 
Equipment and other65,256 41,888 
Land and buildings24,859 12,312 
Construction in progress505,930 408,428 
Properties and equipment, at cost8,367,149 7,107,787 
Accumulated DD&A(3,481,915)(3,012,585)
Properties and equipment, net$4,885,234 $4,095,202 
Schedule of Aging of Capitalized Exploratory Well Costs [Table Text Block] The following table presents the capitalized exploratory well cost pending determination of proved reserves and included in properties and equipment, net on the condensed consolidated balance sheets:
    
Nine Months Ended September 30,Year Ended December 31, 2019
(in thousands, except for number of wells)
Beginning balance$16,078 $12,188 
Additions to capitalized exploratory well costs pending the determination of proved reserves11,540 31,901 
   Reclassifications to proved properties(20,392)(28,011)
Ending balance$7,226 $16,078 
Number of wells pending determination at period-end24