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INVESTMENTS IN SECURITIES (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2015 | Sep. 28, 2014 | Sep. 27, 2015 | Sep. 28, 2014 | Dec. 28, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross realized gains, available-for-sale securities | $ 193,200 | $ 51,900 | $ 390,400 | $ 310,000 |
Gross realized losses, available-for-sale securities | 5,400 | $ 7,700 | 25,400 | $ 8,100 |
Fixed income securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fixed income securities, Amortized Cost | 262,738,000 |  | 262,738,000 |  | $ 204,286,000
Fixed income securities, Fair Value | 262,738,000 |  | 262,738,000 |  | 204,286,000
Other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Fixed income securities, Amortized Cost | 51,000 |  | 51,000 |  | 80,000
Fixed income securities, Fair Value | $ 51,000 |  | $ 51,000 |  | $ 80,000

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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