Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 30, 2018	Jul. 01, 2018
Assets:
Available-for-sale securities	$ 1,349	$ 914	$ 3,054
Derivatives	24,622	26,076	22,551
Total assets	25,971	26,990	25,605
Liabilities:
Derivatives	1,894	1,610	5,191
Option agreement	22,471	23,440	23,546
Total liabilities	24,365	25,050	28,737
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities	1,349	914	3,054
Derivatives	0	0	0
Total assets	1,349	914	3,054
Liabilities:
Derivatives	0	0	0
Option agreement	0	0	0
Total liabilities	0	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	0	0	0
Derivatives	24,622	26,076	22,551
Total assets	24,622	26,076	22,551
Liabilities:
Derivatives	1,894	1,610	5,191
Option agreement	0	0	0
Total liabilities	1,894	1,610	5,191
Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	0	0	0
Derivatives	0	0	0
Total assets	0	0	0
Liabilities:
Derivatives	0	0	0
Option agreement	22,471	23,440	23,546
Total liabilities	$ 22,471	$ 23,440	$ 23,546