Fair Value (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 30, 2013	Mar. 31, 2012
Liabilities included in level 3 representing fair value of contingent consideration associated with acquisitions
Beginning Balance	$ 4,218
Payments	(582)	(39)
Ending Balance	3,579
Fair Value Measurements, Level 3 [Member]
Liabilities included in level 3 representing fair value of contingent consideration associated with acquisitions
Beginning Balance	4,218
Payments	740
Adjustments	101
Ending Balance	$ 3,579

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details