Basis of Presentation (Additional Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Non-cash operating items:
Equity in net (income) loss of affiliates	$ (12,618)	[1]	$ (33,358)	[1]	$ (132)	[1]	$ 7,281	[1]	$ 2,762	[1]	$ (41,586)	[1]	$ 11,353	[1]	$ (6,869)	[1]	$ (38,827)	$ (34,340)	$ (106,329)
Deferred taxes																	28,184	22,003	40,468
Depreciation and amortization																	18	62	115
Stock-based compensation																	417	1,072	1,060
Gain on disposition of net assets																			(6,913)
Amortization of prior service credit and actuarial (gain) loss																	8,687	(8,224)	250
Unrealized (gain) income on nonqualified pension plan assets																		(108)	(157)
Gain on disposition of available-for-sale securities																		(202)
(Gain) loss on foreign currency transactions and contracts																		(1,316)	71
Net non-cash operating items																	(1,521)	(21,053)	(71,435)
Non-cash investing activities:
Note received from land sale	101,000								102,250								101,000	102,250
Non-cash financing activities:
Repurchase of voting common stock not yet paid - continuing operations																			472
Continuing Operations [Member]
Supplemental information:
Interest paid																	17	106	145
Tax payments (refunds)																	(10,061)	122	5,937
Discontinued Operations [Member]
Non-cash operating items:
Net non-cash operating items																		(346,377)	69,209
Non-cash investing activities:
Capital expenditures incurred not yet paid - discontinued operations																			7,766
Supplemental information:
Interest paid																		1,841	1,504
Tax payments (refunds)																	35,074
Land Note [Member]
Non-cash investing activities:
Note received from land sale	$ 101,000								$ 101,000								$ 101,000	$ 101,000

[1] The quarterly earnings per share information is computed separately for each period. Therefore, the sum of such quarterly per share amounts may differ from the total for the year.