Debt Obligations - Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Debt Disclosure [Abstract]
Interest expense	$ 10,022	$ 9,919	$ 29,964	$ 32,008
Amortization of debt costs and discount on debt	1,226	1,180	3,670	3,540
Capitalized interest	(131)	(85)	(412)	(242)
Interest income	(2,085)	(1,887)	(6,267)	(4,211)
Total interest expense, net	$ 9,032	$ 9,127	$ 26,955	$ 31,095