XML 33 R11.htm IDEA: XBRL DOCUMENT
v3.20.4

Property, Plant, and Equipment | 12 Months Ended
--- | ---
Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | 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.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration