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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities      
Net Income $ 86,847 $ 82,345 $ 72,439
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:      
Depreciation and Amortization 78,086 74,666 72,545
Deferred Tax Credits (1,348) (1,405) (1,470)
Deferred Income Taxes 11,507 19,224 24,001
Change in Deferred Debits and Other Assets (15,502) 941 (2,173)
Discretionary Contribution to Pension Plan (22,500) (20,000) 0
Change in Noncurrent Liabilities and Deferred Credits 33,534 (2,414) 19,257
Allowance for Equity/Other Funds Used During Construction (2,553) (2,194) (986)
Stock Compensation Expense – Equity Awards 5,958 4,441 3,642
Other—Net 76 0 10
Cash (Used for) Provided by Current Assets and Current Liabilities:      
Change in Receivables (1,860) (8,559) (2,135)
Change in Inventories 8,419 (18,236) (4,294)
Change in Other Current Assets 2,919 (754) (3,060)
Change in Payables and Other Current Liabilities (171) 14,997 (3,013)
Change in Interest Payable and Income Taxes Receivable 1,625 396 (1,186)
Net Cash Provided by Operating Activities 185,037 143,448 173,577
Cash Flows from Investing Activities      
Capital Expenditures (207,365) (105,425) (132,913)
Proceeds from Disposal of Noncurrent Assets 8,519 2,378 4,491
Cash Used for Investments and Other Assets (10,626) (4,372) (4,168)
Net Cash Used in Investing Activities (209,472) (107,419) (132,590)
Cash Flows from Financing Activities      
Change in Checks Written in Excess of Cash (2,814) (345) 2,434
Net Short-Term (Repayments) Borrowings (12,599) (93,772) 69,488
Proceeds from Issuance of Common Stock 20,338 0 4,349
Common Stock Issuance Expenses (577) (108) 0
Payments for Retirement of Capital Stock (2,730) (3,011) (1,799)
Proceeds from Issuance of Long-Term Debt 100,000 100,000 0
Short-Term and Long-Term Debt Issuance Expenses (950) (761) (380)
Payments for Retirement of Long-Term Debt (172) (189) (48,231)
Dividends Paid (55,723) (53,198) (50,632)
Net Cash Provided by (Used in) Financing Activities 44,773 (51,384) (24,771)
Net Change in Cash and Cash Equivalents 20,338 (15,355) 16,216
Cash and Cash Equivalents at Beginning of Period 861 16,216 0
Cash and Cash Equivalents at End of Period $ 21,199 $ 861 $ 16,216