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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Other, Net | $ 6,135,212 | $ 5,628,840 |
Property, plant and equipment | 8,468,967 | 7,834,557 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | $ (2,333,755) | $ (2,205,717) |
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 2.50% | 2.50% | 2.50%
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 3.50% | 3.50% | 3.50%
Regulated Operation |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Interest Costs Capitalized | $ 5,700 | $ 4,500 | $ 4,200
Property, Plant and Equipment [Line Items] |  |  |
Interest Costs Capitalized | 5,700 | 4,500 | 4,200
Construction in Progress Expenditures Incurred but Not yet Paid | 36,200 | 28,600 | $ 25,600
Property, plant and equipment |  | 7,834,557 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | (2,333,755) | (2,205,717) |
Regulated Operation | Gas Distribution Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 6,716,074 | 6,240,236 |
Regulated Operation | Gas Transmission Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 713,505 | 661,379 |
Regulated Operation | Land, Buildings and Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 907,946 | 782,870 |
Regulated Operation | Construction in Progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 131,442 | $ 150,072 |

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