Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Non-cash operating items:
Equity in net (income) loss of affiliates	$ 14,924	$ (49,645)	$ (44,969)	$ (9,086)
Deferred taxes			(2,175)	(253)
Depreciation			2	3
Right-of-use asset, net of lease liability			(10)	(4)
Recovery of affiliate doubtful receivable			0	(5,854)
Amortization of prior service credit and actuarial (gain) loss			1,110	963
Net non-cash operating items - continuing operations			(46,042)	(14,231)
Supplemental information:
Interest paid - continuing operations			19	20
Income tax refunds			2	178
Income tax payments			$ 242	$ 190