Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Non-cash operating items:
Equity in net (income) loss of affiliates	$ (41,278)	$ 3,455	$ (83,282)	$ (1,639)
Deferred taxes			3,308	(7,043)
Depreciation and amortization			8	11
Right-of-use asset, net of lease liability			16
Amortization of prior service credit and actuarial (gain) loss			501	532
Net non-cash operating items			(79,449)	(8,139)
Supplemental information:
Interest paid			10	11
Income tax refunds			2,980	255
Income tax payments			$ 163	$ 138