Restructuring and Related Charges (Details) - Restructuring accrual activity (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]
Accrual	$ 897	$ 854	$ 732	$ 606
Charges to expense	522	395
Cash payments	(357)	(147)
Lease Obligations [Member]
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]
Accrual	610	854	732	499
Charges to expense		418
Cash payments	(122)	(63)
Severance and Other Termination Costs [Member]
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]
Accrual	287			57
Charges to expense	522	17
Cash payments	(235)	(74)
Other Cost [Member]
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]
Accrual				50
Charges to expense		(40)
Cash payments		$ (10)