Fair Value of Financial Instruments, Assests and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 26, 2016	Dec. 27, 2015	Jun. 28, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	$ 5,597	$ 3,476	$ 5,959
Derivatives, assets	63,277	107,634	105,906
Total assets, fair value hierarchy	68,874	111,110	111,865
Derivatives, liabilities	13,148	1,240	2,748
Option Agreement	27,560	28,360	25,190
Total Liabilities	40,708	29,600	27,938
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	5,597	3,476	5,959
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	5,597	3,476	5,959
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	63,277	107,634	105,906
Total assets, fair value hierarchy	63,277	107,634	105,906
Derivatives, liabilities	13,148	1,240	2,748
Option Agreement	0	0	0
Total Liabilities	13,148	1,240	2,748
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	27,560	28,360	25,190
Total Liabilities	$ 27,560	$ 28,360	$ 25,190