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Business Segment Information: Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	$ 7,305,530	$ 6,784,679
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	22,094	29,055
Electric Utilities
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	3,248,480	3,059,135
Gas Utilities
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	3,312,613	2,981,498
Power Generation
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	534,803	534,518
Mining
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	$ 187,540	$ 180,473

X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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