INVESTMENTS IN SECURITIES (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Dec. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Gross realized gains	$ 4,100,000	$ 2,500,000	$ 9,300,000	$ 5,400,000
Proceeds from sale or maturity of available-for-sale securities	0	$ 0	0	$ 0
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	276,203,000		276,203,000		$ 135,286,000
Fair Value	276,203,000		276,203,000		135,286,000
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	89,049,000		89,049,000		67,474,000
Fair Value	$ 89,049,000		$ 89,049,000		$ 67,474,000

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

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)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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