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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities      
Net Income $ 95,851 $ 86,847 $ 82,345
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:      
Depreciation and Amortization 82,037 78,086 74,666
Deferred Tax Credits (1,221) (1,348) (1,405)
Deferred Income Taxes 15,201 11,507 19,224
Change in Deferred Debits and Other Assets (26,130) (15,502) 941
Discretionary Contribution to Pension Plan (11,200) (22,500) (20,000)
Change in Noncurrent Liabilities and Deferred Credits 34,421 33,534 (2,414)
Allowance for Equity/Other Funds Used During Construction (4,063) (2,553) (2,194)
Stock Compensation Expense 6,284 5,958 4,441
Other—Net (463) 76 0
Cash (Used for) Provided by Current Assets and Current Liabilities:      
Change in Receivables (6,328) (1,860) (8,559)
Change in Inventories 5,686 8,419 (18,236)
Change in Other Current Assets (573) 2,919 (754)
Change in Payables and Other Current Liabilities 19,744 (171) 14,997
Change in Interest Payable and Income Taxes Receivable 2,675 1,625 396
Net Cash Provided by Operating Activities 211,921 185,037 143,448
Investing Activities      
Capital Expenditures (371,553) (207,365) (105,425)
Proceeds from Disposal of Noncurrent Assets 5,011 8,519 2,378
Cash Used for Investments and Other Assets (9,110) (10,626) (4,372)
Net Cash Used in Investing Activities (375,652) (209,472) (107,419)
Financing Activities      
Change in Checks Written in Excess of Cash 4,849 (2,814) (345)
Net Short-Term Borrowings (Repayments) 74,997 (12,599) (93,772)
Proceeds from Issuance of Common Stock 52,432 20,338 0
Common Stock Issuance Expenses (648) (577) (108)
Payments for Shares Withheld for Employee Tax Obligations (2,069) (2,730) (3,011)
Proceeds from Issuance of Long-Term Debt 75,000 100,000 100,000
Short-Term and Long-Term Debt Issuance Expenses (370) (950) (761)
Payments for Retirement of Long-Term Debt (182) (172) (189)
Dividends Paid (60,314) (55,723) (53,198)
Net Cash Provided by Financing Activities 143,695 44,773 (51,384)
Net Change in Cash and Cash Equivalents (20,036) 20,338 (15,355)
Cash and Cash Equivalents at Beginning of Period 21,199 861 16,216
Cash and Cash Equivalents at End of Period 1,163 21,199 861
Supplemental Disclosures of Cash Flow Information      
Interest (net of amount capitalized) 33,199 30,132 28,109
Income Taxes 5,177 4,797 6,109
Supplemental Disclosure of Noncash Investing Activities      
Transactions Related to Capital Additions Not Settled in Cash $ 34,265 $ 37,429 $ 13,757