Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2008
Commitments and Contingencies [Abstract]
Total rental expense under operating leases									$ 28,088	$ 29,327	$ 29,667
Future minimum lease payments for operating leases [Abstract]
2015	25,921								25,921
2016	17,931								17,931
2017	13,025								13,025
2018	2,477								2,477
2019	1,708								1,708
Thereafter	1,574								1,574
Environmental Matters
Accrued environmental liabilities	19,947								19,947
Accrued environmental liabilities, current	10,613								10,613
Accrued environmental liabilities, noncurrent	9,334								9,334
Executive Employment Agreements
Period of royalty payment following termination of employment (in years)									10 years
Royalty Payment Percentage (in hundredths)									5.00%
Present value of royalties, minimum													370,000
Present value of royalties, maximum													445,000
Executive payment made upon amended and restated agreement												10,000
Annual Executive Payment									10,000
Executive compensation credit	0	0	0	0	0	0	1,778	0	0	(1,778)	0
Minimum [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Range of typical unrecorded purchase commitments	30,000								30,000
Maximum [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Range of typical unrecorded purchase commitments	40,000								40,000
General Semiconductor [Member]
Environmental Matters
Accrued environmental liabilities	11,975								11,975
Other Sites [Member]
Environmental Matters
Accrued environmental liabilities	$ 7,972								$ 7,972