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Property, Plant, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, plant and equipment at December 31 was as follows:
| 2020 | 2019 | Weighted Average Depreciable Life in Years
| (Dollars in thousands, where applicable)
Regulated: |  |  |
Electric: |  |  |
Generation | $ | 1,133,390 |  | $ | 1,139,059 |  | 48
Distribution | 464,442 |  | 443,780 |  | 46
Transmission | 524,155 |  | 445,485 |  | 64
Construction in progress | 61,766 |  | 66,664 |  | — |
Other | 139,650 |  | 132,157 |  | 14
Natural gas distribution: |  |  |
Distribution | 2,302,121 |  | 2,133,249 |  | 47
Transmission | 104,695 |  | 104,401 |  | 51
Storage | 33,014 |  | 31,484 |  | 24
General | 198,211 |  | 191,446 |  | 14
Construction in progress | 16,836 |  | 39,506 |  | — |
Other | 213,976 |  | 188,037 |  | 16
Pipeline: |  |  |
Transmission | 665,567 |  | 636,796 |  | 46
Gathering | — |  | 35,661 |  | — |
Storage | 52,632 |  | 50,001 |  | 53
Construction in progress | 46,690 |  | 22,597 |  | — |
Other | 49,640 |  | 48,340 |  | 17
Non-regulated: |  |  |
Pipeline: |  |  |
Gathering | — |  | 31,148 |  | — |
Construction in progress | 4 |  | 154 |  | — |
Other | 7,164 |  | 9,518 |  | 11
Construction materials and contracting: |  |  |
Land | 132,948 |  | 127,729 |  | — |
Buildings and improvements | 130,417 |  | 122,064 |  | 21
Machinery, vehicles and equipment | 1,284,604 |  | 1,180,343 |  | 12
Construction in progress | 23,803 |  | 25,018 |  | — |
Aggregate reserves | 456,704 |  | 455,408 |  | **
Construction services: |  |  |
Land | 7,218 |  | 7,146 |  | — |
Buildings and improvements | 41,674 |  | 31,735 |  | 25
Machinery, vehicles and equipment | 163,080 |  | 156,537 |  | 7
Other | 8,824 |  | 17,952 |  | 4
Other: |  |  |
Land | 2,648 |  | 2,648 |  | — |
Other | 34,897 |  | 32,565 |  | 12
Less accumulated depreciation, depletion and amortization | 3,133,831 |  | 2,991,486 |  |
Net property, plant and equipment | $ | 5,166,939 |  | $ | 4,917,142 |  |
*Depleted on the units-of-production method based on recoverable aggregate reserves.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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