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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Activities      
Net Income $ 176,769 $ 95,851 $ 86,847
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:      
Depreciation and Amortization 91,358 82,037 78,086
Deferred Tax Credits (744) (1,221) (1,348)
Deferred Income Taxes 28,896 15,201 12,026
Discretionary Contribution to Pension Plan (10,000) (11,200) (22,500)
Allowance for Equity Funds Used During Construction (822) (4,063) (2,553)
Stock Compensation Expense 6,908 6,284 5,958
Other, net (3,035) 222 764
Changes in Operating Assets and Liabilities:      
Receivables (60,994) (6,328) (1,860)
Inventories (54,313) 5,686 8,419
Regulatory Assets (4,803) (4,070) 710
Other Assets (14,146) (5,227) 385
Accounts Payable 38,734 3,832 (5,060)
Accrued and Other Liabilities 28,386 19,262 13,074
Regulatory Liabilities 1,948 7,204 4,258
Pension and Other Postretirement Benefits 7,101 8,451 7,831
Net Cash Provided by Operating Activities 231,243 211,921 185,037
Investing Activities      
Capital Expenditures (171,829) (371,553) (207,365)
Proceeds from Disposal of Noncurrent Assets 9,702 5,011 8,519
Purchases of Investments and Other Assets (9,383) (9,110) (10,626)
Net Cash Used in Investing Activities (171,510) (375,652) (209,472)
Financing Activities      
Net Borrowings (Repayments) on Short-Term Debt 10,166 74,997 (12,599)
Proceeds from Issuance of Common Stock 696 52,432 20,338
Proceeds from Issuance of Long-Term Debt 140,000 75,000 100,000
Payments for Retirement of Long-Term Debt (140,169) (182) (172)
Dividends Paid (64,864) (60,314) (55,723)
Payments for Shares Withheld for Employee Tax Obligations (1,507) (2,069) (2,730)
Other, net (3,681) 3,831 (4,341)
Net Cash (Used in) Provided by Financing Activities (59,359) 143,695 44,773
Net Change in Cash and Cash Equivalents 374 (20,036) 20,338
Cash and Cash Equivalents at Beginning of Period 1,163 21,199 861
Cash and Cash Equivalents at End of Period 1,537 1,163 21,199
Supplemental Disclosures of Cash Flow Information      
Interest, net of amount capitalized 36,881 33,199 30,132
Income Taxes 8,445 5,177 4,797
Supplemental Disclosure of Noncash Investing Activities      
Accrued Property, Plant and Equipment Additions $ 12,081 $ 34,265 $ 37,429