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Property, Plant, and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | Property, Plant and Equipment Property, plant and equipment at December 31 was as follows:
| 2021 | 2020 | Weighted Average Depreciable Life in Years
| (Dollars in thousands, where applicable)
Regulated: |  |  |
Electric: |  |  |
Generation | $ | 1,056,632 |  | $ | 1,133,390 |  | 48
Distribution | 474,037 |  | 464,442 |  | 47
Transmission | 562,080 |  | 524,155 |  | 65
Construction in progress | 62,781 |  | 61,766 |  | — |
Other | 140,117 |  | 139,650 |  | 14
Natural gas distribution: |  |  |
Distribution | 2,427,779 |  | 2,302,121 |  | 50
Transmission | 107,721 |  | 104,695 |  | 60
Storage | 34,997 |  | 33,014 |  | 39
General | 197,653 |  | 198,211 |  | 14
Construction in progress | 21,741 |  | 16,836 |  | — |
Other | 225,272 |  | 213,976 |  | 14
Pipeline: |  |  |
Transmission | 673,344 |  | 665,567 |  | 46
Storage | 57,670 |  | 52,632 |  | 53
Construction in progress | 263,640 |  | 46,690 |  | — |
Other | 50,477 |  | 49,640 |  | 17
Non-regulated: |  |  |
Pipeline: |  |  |
Construction in progress | 18 |  | 4 |  | — |
Other | 6,719 |  | 7,164 |  | 10
Construction materials and contracting: |  |  |
Land | 149,066 |  | 132,948 |  | — |
Buildings and improvements | 149,262 |  | 130,417 |  | 21
Machinery, vehicles and equipment | 1,414,260 |  | 1,284,604 |  | 12
Construction in progress | 50,425 |  | 23,803 |  | — |
Aggregate reserves | 584,683 |  | 456,704 |  | *
Construction services: |  |  |
Land | 6,513 |  | 7,218 |  | — |
Buildings and improvements | 39,039 |  | 41,674 |  | 24
Machinery, vehicles and equipment | 166,739 |  | 163,080 |  | 7
Other | 13,467 |  | 8,824 |  | 2
Other: |  |  |
Land | 2,648 |  | 2,648 |  | — |
Other | 34,069 |  | 34,897 |  | 7
Less accumulated depreciation, depletion and amortization | 3,216,461 |  | 3,133,831 |  |
Net property, plant and equipment | $ | 5,756,388 |  | $ | 5,166,939 |  |
*Depleted on the units-of-production method based on recoverable aggregate reserves.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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