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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities    
Net Income $ 30,329 $ 24,268
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:    
Depreciation and Amortization 22,126 20,399
Deferred Tax Credits (186) (329)
Deferred Income Taxes 5,697 5,812
Change in Deferred Debits and Other Assets 543 5,087
Discretionary Contribution to Pension Plan (10,000) (11,200)
Change in Noncurrent Liabilities and Deferred Credits (1,804) 860
Allowance for Equity/Other Funds Used During Construction (45) (791)
Stock Compensation Expense 4,197 2,770
Other—Net (1,569) 46
Cash (Used for) Provided by Current Assets and Current Liabilities:    
Change in Receivables (20,431) (16,666)
Change in Inventories (261) (301)
Change in Other Current Assets (3,871) (447)
Change in Payables and Other Current Liabilities (6,930) (7,690)
Change in Interest Payable and Income Taxes Receivable/Payable (2,525) (41)
Net Cash Provided by Operating Activities 15,270 21,777
Investing Activities    
Capital Expenditures (50,076) (75,059)
Proceeds from Disposal of Noncurrent Assets 3,244 2,487
Cash Used for Investments and Other Assets (2,188) (2,487)
Net Cash Used in Investing Activities (49,020) (75,059)
Financing Activities    
Change in Checks Written in Excess of Cash (2,144) 0
Net Short-Term Borrowings 53,854 13,893
Proceeds from Issuance of Common Stock 0 8,399
Common Stock Issuance Expenses (25) (124)
Payments for Shares Withheld for Employee Tax Obligations (1,507) (2,072)
Proceeds from Issuance of Long-Term Debt 0 35,000
Short-Term and Long-Term Debt Issuance Expenses (2) (177)
Payments for Retirement of Long-Term Debt (169) (45)
Dividends Paid (16,208) (14,907)
Net Cash Provided by Financing Activities 33,799 39,967
Net Change in Cash and Cash Equivalents 49 (13,315)
Cash and Cash Equivalents at Beginning of Period 1,163 21,199
Cash and Cash Equivalents at End of Period 1,212 7,884
Supplemental Disclosure of Noncash Investing Activities    
Transactions Related to Capital Additions Not Settled in Cash $ 18,962 $ 16,193