Income Taxes (Schedule Of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Feb. 02, 2021
Deferred tax assets:
Allowance for doubtful accounts	$ 1,159	$ 1,374
U.S. operating loss and tax credit carryforwards	163,823	157,395
Compensation and employee benefits	6,843	7,376
Decommissioning liabilities	38,989	39,328
Goodwill and other intangible assets	63	369
Operating leases	147	126
Foreign deferred tax assets	45,003	38,780
Other assets	9,779	13,565
Deferred tax assets, gross	265,806	258,313
Valuation allowance	(132,031)	(80,280)
Total deferred tax assets	133,775	178,033
Deferred tax liabilities:
Property, plant and equipment	53,613	64,571
Notes receivable	17,659	17,812
Other Liability	1,399	1,546
Total deferred tax liabilities	72,671	83,929
Net deferred tax assets (liabilities)	61,104	94,104
Deferred Income Tax Assets, Net	67,241	97,492
Deferred Income Tax Liabilities, Net	$ 6,137	$ 3,388	$ 59,522