Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash and Cash Equivalents	$ 118,996	$ 1,537
Receivables, net of allowance for credit losses	144,393	174,953
Inventories	145,952	148,490
Regulatory Assets	24,999	27,342
Other Current Assets	18,412	17,032
Total Current Assets	452,752	369,354
Noncurrent Assets
Investments	54,845	56,690
Property, Plant and Equipment, net of accumulated depreciation	2,212,717	2,124,605
Regulatory Assets	94,655	125,508
Intangible Assets, net of accumulated amortization	7,943	9,044
Goodwill	37,572	37,572
Other Noncurrent Assets	41,177	32,057
Total Noncurrent Assets	2,448,909	2,385,476
Total Assets	2,901,661	2,754,830
Current Liabilities
Short-Term Debt	8,204	91,163
Current Maturities of Long-Term Debt	0	29,983
Accounts Payable	104,400	135,089
Accrued Salaries and Wages	32,327	31,704
Accrued Taxes	19,340	19,245
Regulatory Liabilities	17,300	24,844
Other Current Liabilities	56,065	55,671
Total Current Liabilities	237,636	387,699
Noncurrent Liabilities and Deferred Credits
Pensions Benefit Liability	33,210	73,973
Other Postretirement Benefits Liability	46,977	66,481
Regulatory Liabilities	244,497	234,430
Deferred Income Taxes	221,302	188,268
Deferred Tax Credits	15,916	16,661
Other Noncurrent Liabilities	60,985	62,527
Total Noncurrent Liabilities and Deferred Credits	622,887	642,340
Commitments and Contingencies (Note 13)
Capitalization
Long-Term Debt, net of current maturities	823,821	734,014
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock: 50,000,000 shares authorized of $5 par value; 41,631,113 and 41,551,524 outstanding at December 31, 2022 and 2021	208,156	207,758
Additional Paid-In Capital	423,034	419,760
Retained Earnings	585,212	369,783
Accumulated Other Comprehensive Income (Loss)	915	(6,524)
Total Shareholders' Equity	1,217,317	990,777
Total Capitalization	2,041,138	1,724,791
Total Liabilities and Shareholders' Equity	$ 2,901,661	$ 2,754,830