Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Non-cash operating items:
Equity in net (income) loss of affiliates	$ 24,412	$ (216,347)
Deferred taxes	9,030	80,189
Depreciation and amortization	26	38
Amortization of prior service credit and actuarial (gain) loss	1,071	1,033
Net non-cash operating items - continuing operations	34,539	(135,087)
Continuing Operations [Member]
Supplemental information:
Interest paid	26	27
Tax (refunds) payments, net	$ (8,355)	12,504
Discontinued Operations [Member]
Supplemental information:
Interest paid		$ 55