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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Activities      
Net Income $ 284,184 $ 176,769 $ 95,851
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:      
Depreciation and Amortization 92,597 91,358 82,037
Deferred Tax Credits (745) (744) (1,221)
Deferred Income Taxes 32,424 28,896 15,201
Discretionary Contribution to Pension Plan (20,000) (10,000) (11,200)
Allowance for Equity Funds Used During Construction (1,690) (822) (4,063)
Stock Compensation Expense 6,814 6,908 6,284
Other, net 3,513 (3,035) 222
Changes in Operating Assets and Liabilities:      
Receivables 30,560 (60,994) (6,328)
Inventories 5,339 (54,313) 5,686
Regulatory Assets (2,464) (4,803) (4,070)
Other Assets (368) (14,146) (5,227)
Accounts Payable (29,763) 38,734 3,832
Accrued and Other Liabilities (5,490) 28,386 19,262
Regulatory Liabilities (6,846) 1,948 7,204
Pension and Other Postretirement Benefits 1,244 7,101 8,451
Net Cash Provided by Operating Activities 389,309 231,243 211,921
Investing Activities      
Capital Expenditures (171,134) (171,829) (371,553)
Proceeds from Disposal of Noncurrent Assets 4,346 9,702 5,011
Purchases of Investments and Other Assets (8,283) (9,383) (9,110)
Net Cash Used in Investing Activities (175,071) (171,510) (375,652)
Financing Activities      
Net Borrowings (Repayments) on Short-Term Debt (82,959) 10,166 74,997
Proceeds from Issuance of Common Stock 0 696 52,432
Proceeds from Issuance of Long-Term Debt 90,000 140,000 75,000
Payments for Retirement of Long-Term Debt (30,000) (140,169) (182)
Dividends Paid (68,755) (64,864) (60,314)
Payments for Shares Withheld for Employee Tax Obligations (2,942) (1,507) (2,069)
Other, net (2,123) (3,681) 3,831
Net Cash (Used in) Provided by Financing Activities (96,779) (59,359) 143,695
Net Change in Cash and Cash Equivalents 117,459 374 (20,036)
Cash and Cash Equivalents at Beginning of Period 1,537 1,163 21,199
Cash and Cash Equivalents at End of Period 118,996 1,537 1,163
Supplemental Disclosures of Cash Flow Information      
Interest, net of amount capitalized 35,699 36,881 33,199
Income Taxes 43,411 8,445 5,177
Supplemental Disclosure of Noncash Investing Activities      
Accrued Property, Plant and Equipment Additions $ 12,420 $ 12,081 $ 34,265