Schedule of Restructuring and Related Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost And Reserve [Line Items]
Restructuring charges (benefits)									$ 414	$ 3,757	$ 3,578
Recognized acquisition costs									1,521	1,630	791
Restructuring and acquisition related costs	(14)	771	360	818	663	1,553	743	2,428	1,935	5,387	4,369
JADAK Acquisition | Earn-out Agreement
Restructuring Cost And Reserve [Line Items]
Recognized acquisition costs									612
Acquisition and Related Charges
Restructuring Cost And Reserve [Line Items]
Recognized acquisition costs									909	1,630	791
Novi and United Kingdom
Restructuring Cost And Reserve [Line Items]
Restructuring charges (benefits)											(40)
GERMANY
Restructuring Cost And Reserve [Line Items]
Restructuring charges (benefits)										7	276
2011 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges (benefits)									389	1,287	1,584
2012 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges (benefits)											1,758
2013 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges (benefits)									$ 25	$ 2,463