Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Non-cash operating items:
Equity in net (income) loss of affiliates	$ (25,291)	$ (76,515)	$ (59,893)	$ 40,559
Deferred taxes			(1,052)	(300)
Depreciation			1	2
Right-of-use asset, net of lease liability			(18)	(3)
Amortization of prior service credit and actuarial (gain) loss			740	642
Net non-cash operating items - continuing operations			(60,222)	40,900
Supplemental information:
Interest paid - continuing operations			11	11
Income tax refunds			2	178
Income tax payments			$ 125	$ 126