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INVESTMENTS IN SECURITIES (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Gross realized gains recognized on available-for-sale securities | $ 400,000 | $ 900,000
Gross realized losses recognized on available-for-sale securities | 6,500 | 83,400
Fixed income securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 330,456,000 | 140,480,000
Fair Value | 330,456,000 | 140,480,000
Other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 942,000 | 61,000
Fair Value | $ 942,000 | $ 61,000

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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