Property, Plant and Equipment (Details) - USD ($) $ in Thousands |
12 Months Ended |
Dec. 31, 2022 |
Dec. 31, 2021 |
Property, Plant and Equipment [Line Items] |
|
|
Total gross property, plant and equipment |
$ 8,374,790
|
$ 7,856,573
|
Less accumulated depreciation and depletion |
(1,576,842)
|
(1,407,397)
|
Property, plant and equipment of variable interest entities, net |
6,797,948
|
6,449,176
|
Corporate, Non-Segment |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Property, Plant and Equipment |
5,685
|
5,694
|
Construction in progress, gross |
13,690
|
8,460
|
Total gross property, plant and equipment |
19,375
|
14,154
|
Less accumulated depreciation and depletion |
(1,773)
|
(1,544)
|
Property, plant and equipment of variable interest entities, net |
$ 17,602
|
$ 12,610
|
Weighted Average | Corporate, Non-Segment |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
11 years
|
10 years
|
Minimum | Corporate, Non-Segment |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
4 years
|
|
Maximum | Corporate, Non-Segment |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
24 years
|
|
Production, Gas | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
45 years
|
40 years
|
Production, Gas | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
24 years
|
|
Production, Gas | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
47 years
|
|
Gas transmission | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
58 years
|
58 years
|
Gas transmission | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
32 years
|
|
Gas transmission | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
72 years
|
|
Gas distribution | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
57 years
|
53 years
|
Gas distribution | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
48 years
|
|
Gas distribution | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
60 years
|
|
Cushion gas - depreciable | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
|
28 years
|
Gas, Storage | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
41 years
|
38 years
|
Gas, Storage | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
36 years
|
|
Gas, Storage | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
48 years
|
|
General | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
23 years
|
21 years
|
General | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
3 years
|
|
General | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
25 years
|
|
Electric Utilities |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Total plant in service before construction work in progress |
$ 4,190,734
|
$ 3,991,095
|
Construction work in progress |
152,953
|
181,451
|
Property, Plant and Equipment |
4,343,687
|
4,172,546
|
Less accumulated depreciation and depletion |
(1,104,056)
|
(1,016,738)
|
Property, plant and equipment of variable interest entities, net |
$ 3,239,631
|
3,155,808
|
Depreciation, depletion and amortization, remaining amortization period |
8 years
|
|
Electric Utilities | Production, Electric |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Production, processing and storage |
$ 1,482,081
|
$ 1,452,055
|
Electric Utilities | Production, Electric | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
41 years
|
41 years
|
Electric Utilities | Production, Electric | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
32 years
|
|
Electric Utilities | Production, Electric | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
46 years
|
|
Electric Utilities | Electric transmission |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Transmission |
$ 632,872
|
$ 546,126
|
Electric Utilities | Electric transmission | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
48 years
|
49 years
|
Electric Utilities | Electric transmission | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
40 years
|
|
Electric Utilities | Electric transmission | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
51 years
|
|
Electric Utilities | Electric distribution |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Distribution |
$ 1,082,535
|
$ 1,000,619
|
Electric Utilities | Electric distribution | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
47 years
|
47 years
|
Electric Utilities | Electric distribution | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
45 years
|
|
Electric Utilities | Electric distribution | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
50 years
|
|
Electric Utilities | Integrated Generation |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Plant acquisition adjustment |
$ 713,519
|
$ 720,490
|
Electric Utilities | Integrated Generation | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
31 years
|
30 years
|
Electric Utilities | Integrated Generation | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
19 years
|
|
Electric Utilities | Integrated Generation | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
38 years
|
|
Electric Utilities | Plant acquisition adjustment |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Plant acquisition adjustment |
$ 4,870
|
$ 4,870
|
Electric Utilities | Plant acquisition adjustment | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
32 years
|
32 years
|
Electric Utilities | Plant acquisition adjustment | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
32 years
|
|
Electric Utilities | Plant acquisition adjustment | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
32 years
|
|
Electric Utilities | General |
|
|
Property, Plant and Equipment [Line Items] |
|
|
General |
$ 274,857
|
$ 266,935
|
Electric Utilities | General | Weighted Average |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
27 years
|
28 years
|
Electric Utilities | General | Minimum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
24 years
|
|
Electric Utilities | General | Maximum |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Weighted average useful life |
31 years
|
|
Gas Utilities |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Total plant in service before construction work in progress |
$ 3,959,687
|
$ 3,632,013
|
Construction in progress, gross |
52,041
|
37,860
|
Total gross property, plant and equipment |
4,011,728
|
3,669,873
|
Less accumulated depreciation and depletion |
(471,013)
|
(389,115)
|
Property, plant and equipment of variable interest entities, net |
3,540,715
|
3,280,758
|
Gas Utilities | Production, Gas |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Production, processing and storage |
17,843
|
14,841
|
Gas Utilities | Gas transmission |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Transmission |
695,345
|
645,550
|
Gas Utilities | Gas distribution |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Distribution |
2,620,174
|
2,394,352
|
Gas Utilities | Cushion gas - depreciable |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Production, processing and storage |
|
3,539
|
Gas Utilities | Cushion gas - not depreciable |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Production, processing and storage |
63,137
|
42,478
|
Gas Utilities | Gas, Storage |
|
|
Property, Plant and Equipment [Line Items] |
|
|
Production, processing and storage |
65,781
|
56,289
|
Gas Utilities | General |
|
|
Property, Plant and Equipment [Line Items] |
|
|
General |
$ 497,407
|
$ 474,964
|