Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net Income	$ 77,183	$ 66,495
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	61,230	58,229
Deferred Tax Credits	(986)	(1,011)
Deferred Income Taxes	20,353	3,487
Change in Deferred Debits and Other Assets	3,439	7,142
Discretionary Contribution to Pension Plan	(11,200)	(22,500)
Change in Noncurrent Liabilities and Deferred Credits	3,237	10,344
Allowance for Equity/Other Funds Used During Construction	(3,104)	(1,602)
Stock Compensation Expense	5,282	5,245
Other—Net	(176)	312
Cash (Used for) Provided by Current Assets and Current Liabilities:
Change in Receivables	(20,025)	(16,213)
Change in Inventories	15,980	9,218
Change in Other Current Assets	2,023	2,974
Change in Payables and Other Current Liabilities	(12,063)	(20,744)
Change in Interest and Income Taxes Receivable/Payable	103	3,773
Net Cash Provided by Operating Activities	141,276	105,149
Investing Activities
Capital Expenditures	(220,630)	(149,695)
Proceeds from Disposal of Noncurrent Assets	4,617	4,111
Cash Used for Investments and Other Assets	(6,372)	(5,546)
Net Cash Used in Investing Activities	(222,385)	(151,130)
Financing Activities
Change in Checks Written in Excess of Cash	90	383
Net Short-Term Borrowings	42,600	90,398
Proceeds from Issuance of Common Stock	35,219	0
Common Stock Issuance Expenses	(465)	(35)
Payments for Shares Withheld for Employee Tax Obligations	(2,069)	(2,730)
Proceeds from Issuance of Long-Term Debt	75,000	0
Short-Term and Long-Term Debt Issuance Expenses	(369)	(66)
Payments for Retirement of Long-Term Debt	(136)	(128)
Dividends Paid	(45,056)	(41,781)
Net Cash Provided by Financing Activities	104,814	46,041
Net Change in Cash and Cash Equivalents	23,705	60
Cash and Cash Equivalents at Beginning of Period	21,199	861
Cash and Cash Equivalents at End of Period	$ 44,904	$ 921