Restructuring and Related Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014 MOSFETs Enhanced Competitiveness Program [Member]	Dec. 31, 2013 MOSFETs Enhanced Competitiveness Program [Member]	Sep. 27, 2014 MOSFETs Enhanced Competitiveness Program [Member]	Sep. 27, 2014 Voluntary Separation/Retirement Program [Member]	Dec. 31, 2013 Voluntary Separation/Retirement Program [Member]	Sep. 27, 2014 Voluntary Separation/Retirement Program [Member]	Sep. 27, 2014 Modules Product Transfer [Member]	Sep. 27, 2014 Modules Product Transfer [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current					$ 840		$ 840	$ 5,551		$ 5,551	$ 1,942	$ 1,942
Restructuring and related expense	3,508		18,926		1,522		4,741	(94)		12,105	2,080	2,080
Restructuring Reserve [Roll Forward]
Restructuring and severance costs	3,508	0	18,926	0		2,328	4,741		486	12,105		2,080
Cash paid						(267)	(682)		(98)	(6,654)		(94)
Foreign currency translation									3	(291)		(44)
Balance at end of period					6,120	2,061	6,120	5,551	391	5,551	1,942	1,942
Balance at beginning of period							2,061			391
Term of restructuring program					2 years						12 months
Expected Restructuring Costs	$ 31,700		$ 31,700		$ 16,000		$ 16,000