Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Accounts payable and accrued liabilities
Accounts payable to vendors	$ 205,851	$ 209,031
Accrued compensation and benefits	41,878	33,889
Accrued interest	12,794	19,063
Other accrued expenses	50,817	45,748
Total	$ 311,340	$ 307,731