Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Accounts payable and accrued liabilities
Accounts payable to vendors	$ 209,247	$ 209,031
Accrued salaries, wages, incentive compensation and other fringe benefits	36,325	33,889
Accrued interest	8,315	19,063
Other accrued expenses	48,207	45,678
Total	$ 302,094	$ 307,661