Summary of Fair Values of Assets Acquired and Liabilities Assumed Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			0 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Dec. 31, 2013	Mar. 14, 2014 JADAK
Business Acquisition [Line Items]
Cash				$ 1,140
Accounts receivable				7,907
Inventory				6,791
Property and equipment				904
Intangible assets				40,250
Goodwill	110,783		71,156	45,045
Other assets				1,979
Total assets acquired				104,016
Accounts payable				3,057
Other liabilities				2,074
Deferred tax liabilities				4,089
Total liabilities assumed				9,220
Total purchase price				94,796
Less cash acquired				(1,140)
Total purchase price, net of cash acquired	$ 88,238	$ 82,653		$ 93,656