Basis of Presentation (Additional Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Non-cash operating items:
Equity in net (income) loss of affiliates	$ 44,413	[1]	$ 19,283	[1]	$ (64,363)	[1]	$ 2,169	[1]	$ (12,618)	[1]	$ (33,358)	[1]	$ (132)	[1]	$ 7,281	[1]	$ 1,502	$ (38,827)	$ (34,340)
Deferred taxes																	(10,276)	28,184	22,003
Depreciation and amortization																	42	18	62
Stock-based compensation																		417	1,072
Amortization of prior service credit and actuarial (gain) loss																	456	8,687	(8,224)
Unrealized (gain) income on nonqualified pension plan assets																			(108)
Gain on disposition of available-for-sale securities																			(202)
(Gain) loss on foreign currency transactions and contracts																			(1,316)
Net non-cash operating items																	(8,276)	(1,521)	(21,053)
Non-cash investing activities:
Note received from land sale	33,667								101,000								33,667	101,000
Continuing Operations [Member]
Non-cash operating items:
Net non-cash operating items																	(8,276)	(1,521)	(21,053)
Supplemental information:
Interest paid																	15	17	106
Tax (refunds) payments, net																	(10,265)	(10,061)	122
Discontinued Operations [Member]
Non-cash operating items:
Net non-cash operating items																			(346,377)
Supplemental information:
Interest paid																	227		1,841
Tax (refunds) payments, net																		35,074
Land Note [Member]
Non-cash investing activities:
Note received from land sale																			$ 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.