Debt Obligations - Interest Expense, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Debt Disclosure [Abstract]
Cash interest expense	$ 13,051	$ 13,251
Non-cash amortization of discount on debt	1,190	1,163
Interest income	(940)	(343)
Total interest expense, net	$ 13,301	$ 14,071