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Debt Obligations - Debt & Capital Leases (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Dec. 28, 2014	Nov. 30, 2010	Mar. 31, 2009	Dec. 31, 2005
Debt Instrument [Line Items]
Principal amount	$ 439,170
Less: Unamortized debt costs and discount	14,698
Long-term capital lease obligations	6,756	$ 6,736
Total debt and capital lease obligations	431,228	650,120
Less current portion	188,377	223,662
Long-term debt and capital lease obligations	242,851	$ 426,458
Notes Due 2015 [Member]
Debt Instrument [Line Items]
Stated interest rate on debt		5.00%			5.00%
Principal amount	0	$ 223,669
Less: Unamortized debt costs and discount	0	7
Long-term debt	$ 0	$ 223,662
Notes Due 2016 [Member]
Debt Instrument [Line Items]
Stated interest rate on debt	6.625%	6.625%	6.625%
Principal amount	$ 189,170	$ 189,170
Less: Unamortized debt costs and discount	793	1,566
Long-term debt	$ 188,377	$ 187,604
Option To Repurchase Headquarters Building 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	13.00%	13.00%		13.00%
Principal amount	$ 250,000	$ 250,000
Less: Unamortized debt costs and discount	13,905	17,882
Long-term debt	$ 236,095	$ 232,118