Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Fair Value of Financial Instruments [Abstract]
Fair value of available for sale investments, fair value option	$ 23,913	$ 24,436
Gain on available for sale investments, fair value option	$ (180)	1,500	$ 1,010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Redemption period	45 days
Reconciliation of Level 3 Assets
Balance at beginning of year	$ (23,980)	(28,770)
(Loss) gain from change in fair value	540	4,790
Balance at end of year	$ (23,440)	(23,980)	$ (28,770)
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Redemption period	30 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Redemption period	90 days
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	$ 914	3,126
Derivatives, assets	26,076	12,226
Total assets	26,990	15,352
Derivatives, liabilities	1,610	23,051
Option Agreement	23,440	23,980
Total Liabilities	25,050	47,031
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	914	3,126
Derivatives, assets	0	0
Total assets	914	3,126
Derivatives, liabilities	0	0
Option Agreement	0	0
Total 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	0	0
Derivatives, assets	26,076	12,226
Total assets	26,076	12,226
Derivatives, liabilities	1,610	23,051
Option Agreement	0	0
Total Liabilities	1,610	23,051
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	0	0
Derivatives, assets	0	0
Total assets	0	0
Derivatives, liabilities	0	0
Option Agreement	23,440	23,980
Total Liabilities	$ 23,440	$ 23,980