CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 35,003	$ 13,428
Accounts and notes receivable, net	216,744	255,746
Inventory	159,984	107,674
Regulatory assets	146,327	193,787
Other current assets	103,784	151,167
Total current assets	661,842	721,802
Net utility property	5,700,056	5,444,709
Goodwill	52,426	52,426
Non-current regulatory assets	894,168	833,328
Other property and investments-net and other non-current assets	393,985	365,085
Total assets	7,702,477	7,417,350
Current Liabilities:
Accounts payable	143,262	202,954
Current portion of long-term debt	15,000	13,500
Short-term borrowings	349,000	463,000
Regulatory liabilities	76,007	95,665
Other current liabilities	191,936	189,415
Total current liabilities	775,205	964,534
Pensions and other postretirement benefits	89,830	93,901
Deferred income taxes	718,318	674,995
Non-current regulatory liabilities	856,666	840,837
Other non-current liabilities and deferred credits	210,230	175,855
Total liabilities	5,217,154	5,082,682
Commitments and Contingencies (See Notes to Consolidated Financial Statements)
Equity:
Common stock, no par value; 200,000,000 shares authorized; 78,073,587 and 74,945,948 shares issued and outstanding, respectively	1,644,327	1,525,185
Accumulated other comprehensive loss	(357)	(2,058)
Retained earnings	841,353	811,541
Total equity	2,485,323	2,334,668
Total liabilities and equity	7,702,477	7,417,350
Non Affiliated Trusts [Member]
Current Liabilities:
Long-term debt	2,515,358	2,281,013
Affiliated Trusts [Member]
Current Liabilities:
Long-term debt	$ 51,547	$ 51,547