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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Activities      
Net Income $ 301,662 $ 294,191 $ 284,184
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:      
Depreciation and Amortization 107,121 97,954 92,597
Deferred Tax Credits (182) (744) (745)
Deferred Income Taxes 23,057 13,508 32,424
Discretionary Contribution to Pension Plan 0 0 (20,000)
Investment (Gains) Losses (5,482) (7,222) 3,296
Stock Compensation Expense 9,529 7,753 6,814
Other, net (3,111) (423) (1,473)
Changes in Operating Assets and Liabilities:      
Receivables 11,179 (12,750) 30,560
Inventories 3,691 (2,450) 5,339
Regulatory Assets 5,194 12,479 (2,464)
Other Assets (11,640) 2,817 (368)
Accounts Payable 14,826 (9,988) (29,763)
Accrued and Other Liabilities (10,371) 6 (5,490)
Regulatory Liabilities 16,821 20,973 (6,846)
Pension and Other Postretirement Benefits (9,563) (11,605) 1,244
Net Cash Provided by Operating Activities 452,731 404,499 389,309
Investing Activities      
Capital Expenditures (358,650) (287,134) (171,134)
Proceeds from Disposal of Noncurrent Assets 8,849 6,225 4,346
Purchases of Investments and Other Assets (61,573) (8,378) (8,283)
Net Cash Used in Investing Activities (411,374) (289,287) (175,071)
Financing Activities      
Net (Repayments) Borrowings on Short-Term Debt (11,807) 73,218 (82,959)
Proceeds from Issuance of Long-Term Debt 120,000 0 90,000
Payments for Retirement of Long-Term Debt 0 0 (30,000)
Dividends Paid (78,266) (73,061) (68,755)
Payments for Shares Withheld for Employee Tax Obligations (6,457) (3,088) (2,942)
Other, net (549) (904) (2,123)
Net Cash Provided by (Used in) Financing Activities 22,921 (3,835) (96,779)
Net Change in Cash and Cash Equivalents 64,278 111,377 117,459
Cash and Cash Equivalents at Beginning of Period 230,373 118,996 1,537
Cash and Cash Equivalents at End of Period 294,651 230,373 118,996
Supplemental Disclosures of Cash Flow Information      
Interest, net of amount capitalized 39,484 36,956 35,699
Income Taxes 57,614 46,284 43,411
Supplemental Disclosure of Noncash Investing Activities      
Accrued Property, Plant and Equipment Additions $ 20,281 $ 13,001 $ 12,420