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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive loss
Foreign currency translation adjustments	$ (4,675)	$ (6,807)
Unrealized gain on available-for-sale securities	0	1,685
Accumulated other comprehensive loss	(21,562)	(22,170)
U.S. [Member]
Accumulated other comprehensive loss
Employee benefit related adjustments, net of tax	(16,561)	(16,500)
Mexico [Member]
Accumulated other comprehensive loss
Employee benefit related adjustments, net of tax	$ (326)	$ (548)

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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