Fair Value of Financial Instruments, Assests and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 27, 2016	Dec. 27, 2015	Mar. 29, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	$ 6,109	$ 3,476	$ 4,836
Derivatives, assets	69,720	107,634	130,550
Total assets, fair value hierarchy	75,829	111,110	135,386
Derivatives, liabilities	3,932	1,240	3,513
Option Agreement	27,920	28,360	24,920
Total Liabilities	31,852	29,600	28,433
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	6,109	3,476	4,836
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	6,109	3,476	4,836
Derivatives, liabilities	0	0	0
Option Agreement	0	0	0
Total Liabilities	0	0	0
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	0	0	0
Derivatives, assets	69,720	107,634	130,550
Total assets, fair value hierarchy	69,720	107,634	130,550
Derivatives, liabilities	3,932	1,240	3,513
Option Agreement	0	0	0
Total Liabilities	3,932	1,240	3,513
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	0	0	0
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	0	0	0
Derivatives, liabilities	0	0	0
Option Agreement	27,920	28,360	24,920
Total Liabilities	$ 27,920	$ 28,360	$ 24,920