Fair Value of Financial Instruments, Assests and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 30, 2018	Apr. 01, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, assets	$ 975	$ 914	$ 2,941
Derivatives, assets	32,296	26,076	2,960
Total assets, fair value hierarchy	33,271	26,990	5,901
Derivatives, liabilities	45	1,610	39,428
Option Agreement	23,144	23,440	23,665
Total Liabilities	$ 23,189	25,050	63,093
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	45 days
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	30 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period	90 days
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	$ 975	914	2,941
Derivatives, assets	0	0	0
Total assets, fair value hierarchy	975	914	2,941
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	32,296	26,076	2,960
Total assets, fair value hierarchy	32,296	26,076	2,960
Derivatives, liabilities	45	1,610	39,428
Option Agreement	0	0	0
Total Liabilities	45	1,610	39,428
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	23,144	23,440	23,665
Total Liabilities	$ 23,144	$ 23,440	$ 23,665