Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Current assets:
Cash, cash equivalents and restricted cash	$ 59,541	$ 66,904	$ 72,724
Receivables, net	269,246	274,303	239,259
Current regulatory assets	143,341	215,436	158,614
Inventories	18,457	44,940	13,784
Prepayments and other current assets	50,966	64,676	65,077
Current assets of discontinued operations	0	0	770,486
Total current assets	541,551	666,259	1,319,944
Noncurrent assets:
Property, plant and equipment	7,617,007	7,554,063	7,174,730
Less accumulated depreciation and amortization	2,238,371	2,209,771	2,114,539
Net property, plant and equipment	5,378,636	5,344,292	5,060,191
Goodwill	345,736	345,736	345,736
Regulatory assets	312,008	322,350	414,433
Investments	117,599	115,459	108,574
Other	265,944	244,722	238,149
Noncurrent assets of discontinued operations	0	0	352,844
Total noncurrent assets	6,419,923	6,372,559	6,519,927
Total assets	6,961,474	7,038,818	7,839,871
Current liabilities:
Long-term debt due within one year	161,700	161,700	60,700
Accounts payable	109,133	150,070	113,333
Regulatory liabilities due within one year	140,165	137,167	90,115
Taxes payable	65,218	43,372	58,654
Dividends payable	26,563	26,511	25,044
Accrued compensation	18,175	35,264	16,018
Other accrued liabilities	113,622	124,514	119,863
Current liabilities of discontinued operations	0	0	439,096
Total current liabilities	634,576	678,598	922,823
Noncurrent liabilities:
Long-term debt	2,031,976	2,130,910	2,193,697
Deferred income taxes	429,825	441,320	455,403
Regulatory liabilities	463,879	459,170	523,484
Asset retirement obligations	410,715	406,351	388,451
Other	247,367	231,895	193,241
Noncurrent liabilities of discontinued operations	0	0	181,831
Total noncurrent liabilities	3,583,762	3,669,646	3,936,107
Commitments and contingencies
Stockholders' equity:
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 204,331,170 at March 31, 2025, 203,888,237 at March 31, 2024 and 203,934,578 at December 31, 2024	204,331	203,935	203,888
Other paid-in capital	1,470,512	1,473,738	1,466,551
Retained earnings	1,084,899	1,029,699	1,328,812
Accumulated other comprehensive loss	(16,606)	(16,798)	(18,310)
Total stockholders' equity	2,743,136	2,690,574	2,980,941
Total liabilities and stockholders' equity	$ 6,961,474	$ 7,038,818	$ 7,839,871

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1