Debt Obligations - Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Debt Disclosure [Abstract]
Cash interest expense	$ 9,920	$ 13,153	$ 22,089	$ 26,204
Amortization of debt costs and discount on debt	1,145	1,128	2,360	2,318
Capitalized interest	(106)	(82)	(157)	(82)
Interest income	(1,183)	(994)	(2,324)	(1,934)
Total interest expense, net	$ 9,776	$ 13,205	$ 21,968	$ 26,506