Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jan. 01, 2012
Summary of accrued expenses
Accrued interest	$ 14,371	$ 18,072
Accrued bonus	11,762	8,849
Accrued insurance	52,593	52,437
Accrued property and other taxes	12,074	12,959
Construction retainage	293	8,247
Other	25,464	25,272
Total	$ 116,557	$ 125,836