Discontinued Operations and Assets Held for Sale Discontinued Business Unit Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before sale of business unit	$ 0	$ (430)
Gain on sale of business unit, net of transaction expenses	0	5,449
Income (loss) from discontinued operations, net of tax	0	3,011
Semiconductor Business Unit [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales and revenues	0	425
Gross margin	0	(296)
Loss from discontinued operations before sale of business unit	0	(430)
Gain on sale of business unit, net of transaction expenses	0	5,449
Income tax provision	0	(2,008)
Income (loss) from discontinued operations, net of tax	$ 0	$ 3,011