Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable and other receivables
Reserves deducted from asset accounts:
Balance at Beginning of Year	$ 10,636	$ 10,636	$ 10,636
Balance at End of Year	10,636	10,636	10,636
Current assets - supplies and inventory
Reserves deducted from asset accounts:
Balance at Beginning of Year	2,249	574	2,216
Additions (Reductions) Charged to Costs and Expenses	314	1,860	477
Charged to Other Accounts			(137)
Deductions	124	185	1,982
Balance at End of Year	2,439	2,249	574
Deferred income taxes
Reserves deducted from asset accounts:
Balance at Beginning of Year	504,392	573,995	506,316
Additions (Reductions) Charged to Costs and Expenses	(420,688)	(69,603)	76,524
Charged to Other Accounts			(8,845)
Balance at End of Year	$ 83,704	$ 504,392	$ 573,995