Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis - Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 26, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments of contingent consideration for acquisitions		$ 434	$ 0
Monte Carlo Simulation Valuation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Undiscounted maximum payment under the contingent consideration arrangements		7,900
Payments of contingent consideration for acquisitions	$ 300	$ 400