A summary of the historical cost of property, plant, and equipment is as follows:
December 31,
thousandsEstimated Useful Life20252024
LandN/A$111,346 $13,041 
Gathering systems – pipelines30 Years6,022,315 5,848,865 
Gathering systems – compressors15 Years2,835,946 2,718,145 
Processing complexes and treating facilities25 Years4,311,653 4,046,670 
Transportation pipeline and equipment
3 to 48 Years
260,577 257,289 
Produced-water disposal and recycling systems20 Years2,638,350 1,198,742 
Assets under constructionN/A435,953 460,056 
Other
3 to 40 Years
1,032,235 967,102 
Total property, plant, and equipment17,648,375 15,509,910 
Less accumulated depreciation6,427,467 5,795,301 
Net property, plant, and equipment$11,220,908 $9,714,609 
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About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.