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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating Activities    
Net Income $ 157,940 $ 72,398
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:    
Depreciation and Amortization 47,113 45,295
Deferred Tax Credits (373) (372)
Deferred Income Taxes 25,160 11,327
Discretionary Contribution to Pension Plan (20,000) (10,000)
Allowance for Equity Funds Used During Construction (617) (172)
Stock Compensation Expense 5,511 5,524
Other, Net 4,893 (2,864)
Changes in Operating Assets and Liabilities:    
Receivables (50,885) (49,465)
Inventories 2,889 (10,859)
Regulatory Assets 5,604 5,753
Other Assets 3,240 (12,920)
Accounts Payable 1,933 16,905
Accrued and Other Liabilities (3,394) (468)
Regulatory Liabilities (3,859) (4,811)
Pension and Other Postretirement Benefits 475 3,303
Net Cash Provided by Operating Activities 175,630 68,574
Investing Activities    
Capital Expenditures (70,791) (76,891)
Proceeds from Disposal of Noncurrent Assets 2,840 4,562
Cash Used for Investments and Other Assets (5,944) (4,074)
Net Cash Used in Investing Activities (73,895) (76,403)
Financing Activities    
Net Borrowings (Repayments) on Short-Term Debt (91,163) 46,960
Proceeds from Issuance of Long-Term Debt 90,000 0
Payments for Retirement of Long-Term Debt 0 (169)
Dividends Paid (34,372) (32,426)
Payments for Shares Withheld for Employee Tax Obligations (2,942) (1,507)
Other, net (2,806) (4,712)
Net Cash (Used in) Provided by Financing Activities (41,283) 8,146
Net Change in Cash and Cash Equivalents 60,452 317
Cash and Cash Equivalents at Beginning of Period 1,537 1,163
Cash and Cash Equivalents at End of Period $ 61,989 $ 1,480