Acquisitions Additional information (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Apr. 01, 2013	Apr. 02, 2012	Dec. 31, 2011
Acquisitions [Abstract]
Acquired Intangible assets, Weighted Average Useful Life		10 years
Cash paid at closing			$ 13,357,000
Equity Method Investment, Ownership Percentage					50.00%
Business Acquisition, Percentage of Voting Interests Acquired				50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value				2,900,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	1,300,000
Goodwill			10,090,000	1,900,000
Foreign currency transaction gain realized upon acquisition	200,000
Business Acquisition, Contingent Consideration, Potential Cash Payment			14,500,000
Estimated contingent consideration			3,095,000
Total purchase price			$ 16,452,000	$ 3,400,000