Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	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	53,951	45,748
Total	$ 336,374	$ 307,731