| Property, Plant, and Equipment Table |
A summary of the historical cost of property, plant, and equipment is as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | thousands | | Estimated Useful Life | | March 31, 2022 | | December 31, 2021 | | Land | | N/A | | $ | 10,955 | | | $ | 10,955 | | | Gathering systems – pipelines | | 30 years | | 5,429,779 | | | 5,386,003 | | | Gathering systems – compressors | | 15 years | | 2,203,895 | | | 2,172,953 | | | Processing complexes and treating facilities | | 25 years | | 3,380,819 | | | 3,375,317 | | | Transportation pipeline and equipment | | 6 to 45 years | | 169,380 | | | 169,356 | | Produced-water disposal systems | | 20 years | | 885,265 | | | 882,527 | | | Assets under construction | | N/A | | 91,268 | | | 98,473 | | | Other | | 3 to 40 years | | 758,997 | | | 750,494 | | | Total property, plant, and equipment | | | | 12,930,358 | | | 12,846,078 | | | Less accumulated depreciation | | | | 4,455,162 | | | 4,333,171 | | | Net property, plant, and equipment | | | | $ | 8,475,196 | | | $ | 8,512,907 | |
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