Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Non-cash operating items:
Equity in net (income) loss of affiliates	$ (42,004)	$ (5,094)
Deferred taxes	1,464	(1,141)
Depreciation and amortization	6	5
Right-of-use asset, net of lease liability	4
Amortization of prior service credit and actuarial (gain) loss	230	269
Net non-cash operating items	(40,300)	(5,961)
Supplemental information:
Interest paid	5	5
Income tax refunds	2,980	245
Income tax payments	$ 101	$ 64