Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Non-cash operating items:
Equity in net (income) loss of affiliates	$ (8,784)	$ (55,095)	$ (92,066)	$ (56,734)
Deferred taxes			2,802	(1,237)
Depreciation and amortization			9	16
Right-of-use asset, net of lease liability			12
Amortization of prior service credit and actuarial (gain) loss			752	797
Net non-cash operating items			(88,491)	(57,158)
Supplemental information:
Interest paid			15	17
Income tax refunds			2,980	255
Income tax payments			$ 226	$ 200