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Properties and Equipment (Tables)
 6 Months Ended
Jun. 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"):
 
June 30, 2020
 
December 31, 2019
 
(in thousands)
Properties and equipment, net:
 
 
 
Crude oil and natural gas properties
 
 
 
Proved
$
7,369,104

 
$
6,241,780

Unproved
385,322

 
403,379

Total crude oil and natural gas properties
7,754,426

 
6,645,159

Equipment and other
64,898

 
41,888

Land and buildings
26,014

 
12,312

Construction in progress
492,497

 
408,428

Properties and equipment, at cost
8,337,835

 
7,107,787

Accumulated DD&A
(3,337,769
)
 
(3,012,585
)
Properties and equipment, net
$
5,000,066

 
$
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:
    
 
 
Six Months Ended June 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 reserves
 
11,556

 
31,901

   Reclassifications to proved properties
 
(20,431
)
 
(28,011
)
Ending balance
 
$
7,203

 
$
16,078

 
 
 
 
 
Number of wells pending determination at period-end
 
2

 
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