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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating Activities    
Net Income $ 41,249 $ 41,750
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:    
Depreciation and Amortization 40,835 38,572
Deferred Tax Credits (657) (674)
Deferred Income Taxes 9,472 960
Change in Deferred Debits and Other Assets 5,565 3,884
Discretionary Contribution to Pension Plan (11,200) (10,000)
Change in Noncurrent Liabilities and Deferred Credits 5,178 11,942
Allowance for Equity/Other Funds Used During Construction (1,858) (688)
Stock Compensation Expense 4,007 3,944
Other—Net (147) 276
Cash (Used for) Provided by Current Assets and Current Liabilities:    
Change in Receivables (3,929) (30,478)
Change in Inventories 8,097 410
Change in Other Current Assets (1,066) 2,870
Change in Payables and Other Current Liabilities (23,562) 222
Change in Interest and Income Taxes Receivable/Payable 1,917 6,297
Net Cash Provided by Operating Activities 73,901 69,287
Investing Activities    
Capital Expenditures (119,830) (54,012)
Proceeds from Disposal of Noncurrent Assets 3,953 3,405
Cash Used for Investments and Other Assets (5,128) (4,776)
Net Cash Used in Investing Activities (121,005) (55,383)
Financing Activities    
Change in Checks Written in Excess of Cash 550 (1,120)
Net Short-Term Borrowings 35,239 18,003
Proceeds from Issuance of Common Stock 27,225 0
Common Stock Issuance Expenses (374) 0
Payments for Shares Withheld for Employee Tax Obligations (2,069) (2,730)
Proceeds from Issuance of Long-Term Debt 35,000 0
Short-Term and Long-Term Debt Issuance Expenses (179) 0
Payments for Retirement of Long-Term Debt (90) (84)
Dividends Paid (29,885) (27,852)
Net Cash Provided by (Used in) Financing Activities 65,417 (13,783)
Net Change in Cash and Cash Equivalents 18,313 121
Cash and Cash Equivalents at Beginning of Period 21,199 861
Cash and Cash Equivalents at End of Period $ 39,512 $ 982