Basis of Presentation (Additional Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Non-cash operating items:
Equity in net (income) loss of affiliates	$ (116,716)	$ (101,403)
Affiliate doubtful receivable recovery	(5,854)	0
Deferred taxes	11,362	2,987
Depreciation	4	15
Right-of-use asset, net of lease liability	(6)	9
Amortization of prior service credit and actuarial (gain) loss	1,299	1,008
Net non-cash operating items - continuing operations	(109,911)	(97,384)
Continuing Operations [Member]
Supplemental information:
Interest paid - continuing operations	26	24
Income tax refunds	178	5,547
Income tax payments	$ 252	$ 288

Defined benefit plan amortization of actuarial loss and prior service credits.

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The aggregate amount of adjustments to net income or loss necessary to remove the effects of all items whose cash effects are investing or financing cash flows. The aggregate amount also includes all noncash expenses and income items which reduce or increase net income and are thus added back or deducted when calculating cash provided by or used in operating activities.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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