Fair Value of Financial Instruments, Assests and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 25, 2016	Dec. 27, 2015	Sep. 27, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	$ 4,986	$ 3,476	$ 4,029
Derivatives, assets	39,115	107,634	119,123
Total assets, fair value hierarchy	44,101	111,110	123,152
Derivatives, liabilities	19,390	1,240	605
Option Agreement	27,460	28,360	24,780
Total Liabilities	46,850	29,600	25,385
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	4,986	3,476	4,029
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	4,986	3,476	4,029
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	39,115	107,634	119,123
Total assets, fair value hierarchy	39,115	107,634	119,123
Derivatives, liabilities	19,390	1,240	605
Option Agreement	0	0	0
Total Liabilities	19,390	1,240	605
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	27,460	28,360	24,780
Total Liabilities	$ 27,460	$ 28,360	$ 24,780