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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The following table summarizes our oil and natural gas properties as of December 31, 2021 and 2020:

As of December 31,
20212020
(in thousands)
Proved oil and natural gas properties (successful efforts method)$6,043,602 $4,910,059 
Unproved oil and natural gas properties308,721 288,459 
Oil and natural gas properties, at cost6,352,323 5,198,518 
Less accumulated depreciation, depletion, amortization and impairment(1,881,934)(1,633,664)
Oil and natural gas properties, net$4,470,389 $3,564,854 

Other Property

The following table summarizes other property, plant and equipment as of December 31, 2021 and 2020:

Estimated useful life
As of December 31,
20212020
(years)
(in thousands)
Gathering and pipeline system30$106,023 $108,777 
Vehicles
3-5
10,836 7,273 
Computers, furniture, and equipment
3-10
7,175 6,812 
Buildings and improvements
5-30
6,641 6,797 
Land5,467 5,700 
Financing right of use asset5,249 — 
Field inventory2,927 3,012 
Total field and other property and equipment, at cost144,318 138,371 
Less: accumulated depreciation, amortization and impairment(59,594)(61,078)
Total field and other property and equipment, net$84,724 $77,293 

Capitalized Exploratory Well Costs

Capitalized exploratory well costs are included in unproved oil and natural gas properties. The following table reflects the net changes in capitalized exploratory well costs for the years ended December 31, 2021 and 2020:

As of December 31,
20212020
(in thousands)
Balance at beginning of period$— $— 
Additions pending the determination of proved reserves— — 
Reclassifications to proved properties— — 
Cost charged to expense— — 
Balance at end of period$— $— 

As of December 31, 2021, we did not have any capitalized exploratory well costs.