Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable and other receivables
Reserves deducted from asset accounts:
Balance at Beginning of Year	$ 10,636	$ 10,636	$ 10,636
Additions (Reductions) Charged to Costs and Expenses	(2,200)
Deductions	8,436
Balance at End of Year	0	10,636	10,636
Current assets - supplies and inventory
Reserves deducted from asset accounts:
Balance at Beginning of Year	2,439	2,249	574
Additions (Reductions) Charged to Costs and Expenses	522	314	1,860
Deductions	1,365	124	185
Balance at End of Year	1,596	2,439	2,249
Deferred income taxes
Reserves deducted from asset accounts:
Balance at Beginning of Year	83,704	504,392	573,995
Additions (Reductions) Charged to Costs and Expenses	(879)	(420,688)	(69,603)
Charged to Other Accounts
Balance at End of Year	$ 82,825	$ 83,704	$ 504,392