Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Fair Value of Financial Instruments [Abstract]
Fair value of available for sale investments, fair value option	$ 28,048	$ 24,091
Gain on available for sale investments, fair value option	152	2,504	61
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	45 Days
Reconciliation of Level 3 Assets
Balance at beginning of year	7,618	3,724
Purchases	0	5,000
Sales	(990)	0
Loss from change in fair value	(1,144)	(1,106)
Balance at end of year	5,484	7,618	3,724
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	28,048	24,099
Derivatives, assets	4,627	4,254
Total assets	32,675	28,353
Derivatives, liabilities	12,330	3,461
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	0	8
Derivatives, assets	0	0
Total assets	0	8
Derivatives, liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	22,564	18,986
Derivatives, assets	4,627	1,741
Total assets	27,191	20,727
Derivatives, liabilities	12,330	3,461
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	5,484	5,105
Derivatives, assets	0	2,513
Total assets	5,484	7,618
Derivatives, liabilities	$ 0	$ 0