Debt Obligations - Debt and Capital Leases (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 30, 2012
Total debt and capital lease obligations
Total debt	$ 691,219		$ 690,055
Short-term capital lease obligations	140	[1]	164	[1]
Long-term capital lease obligations	6,852		6,859
Total capital lease obligations	6,992		7,023
Total debt and capital lease obligations	698,211		697,078
Notes Due 2015 [Member]
Total debt and capital lease obligations
Long-term debt	244,031		244,022
Interest rate on debt	5.00%
Notes Due 2016 [Member]
Total debt and capital lease obligations
Long-term debt	221,715		221,523
Interest rate on debt	6.625%
Option to repurchase ownership interest in headquarters building in 2019 [Member]
Total debt and capital lease obligations
Long-term debt	$ 225,473		$ 224,510

[1] Included in “Accrued expenses and other” in our Condensed Consolidated Balance Sheets.