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INVESTMENTS IN SECURITIES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	$ 2,900,000	$ 1,800,000	$ 5,100,000	$ 2,900,000
Proceeds from sale or maturity of available-for-sale securities	0		0
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	260,291,000		260,291,000		$ 135,286,000
Fair Value	260,291,000		260,291,000		135,286,000
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,700,000		88,700,000		67,474,000
Fair Value	$ 88,700,000		$ 88,700,000		$ 67,474,000

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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-Publisher FASB
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-Section 45
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