INVESTMENTS IN SECURITIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	$ 1,000	$ 2,900	$ 2,400	$ 5,100
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Cost	31,019		31,019		$ 159,623
Fair Value	31,019		31,019		159,623
Other
Debt Securities, Available-for-sale [Line Items]
Cost	35,301		35,301		0
Fair Value	$ 35,301		$ 35,301		$ 0