Acquired Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	$ 42,355	$ 36,070
Finite-Lived Intangible Assets, Accumulated Amortization	25,487	22,605
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	24,220	24,220
Finite-Lived Intangible Assets, Accumulated Amortization	22,061	19,882
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	2,749	2,367
Finite-Lived Intangible Assets, Accumulated Amortization	2,192	2,053
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	9,073	5,054
Finite-Lived Intangible Assets, Accumulated Amortization	1,112	548
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	6,313	4,429
Finite-Lived Intangible Assets, Accumulated Amortization	$ 122	$ 122