Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Accounts payable and accrued liabilities
Accounts payable to vendors	$ 222,428	$ 209,031
Accrued compensation and benefits	39,489	33,889
Accrued interest	20,506	19,063
Other accrued expenses	50,937	45,678
Total	$ 333,360	$ 307,661