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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands | Sep. 25, 2015 | Dec. 26, 2014
--- | --- | ---
Fair Value Measurement [Line Items] |  |
Other restricted assets | $ 11,647 | $ 11,836
Restricted investments classified as held-to-maturity | 117,519 | 91,066
Carrying Value |  |
Fair Value Measurement [Line Items] |  |
Cash and cash equivalents | 23,232 | 19,666
Carrying Value | Restricted Assets |  |
Fair Value Measurement [Line Items] |  |
Restricted cash and cash equivalents | 53,944 | 68,359
Other restricted assets | 11,647 | 9,972
Restricted investments classified as held-to-maturity | 116,319 | 90,095
Total Fair Value |  |
Fair Value Measurement [Line Items] |  |
Cash and cash equivalents | 23,232 | 19,666
Total Fair Value | Certificate of deposits |  |
Fair Value Measurement [Line Items] |  |
Marketable securities classified as available-for-sale |  | 1,500
Total Fair Value | Restricted Assets |  |
Fair Value Measurement [Line Items] |  |
Restricted cash and cash equivalents | 53,944 | 68,359
Other restricted assets | 11,647 | 9,972
Restricted investments classified as held-to-maturity | 117,519 | 91,066
Level 1 |  |
Fair Value Measurement [Line Items] |  |
Cash and cash equivalents | 23,232 | 19,666
Marketable securities classified as available-for-sale |  | 0
Level 1 | Restricted Assets |  |
Fair Value Measurement [Line Items] |  |
Restricted cash and cash equivalents | 53,944 | 68,359
Other restricted assets | 11,647 | 9,972
Restricted investments classified as held-to-maturity | 0 | 0
Level 2 |  |
Fair Value Measurement [Line Items] |  |
Cash and cash equivalents | 0 | 0
Level 2 | Certificate of deposits |  |
Fair Value Measurement [Line Items] |  |
Marketable securities classified as available-for-sale |  | 1,500
Level 2 | Restricted Assets |  |
Fair Value Measurement [Line Items] |  |
Restricted cash and cash equivalents | 0 | 0
Other restricted assets | 0 | 0
Restricted investments classified as held-to-maturity | 117,519 | 91,066
Level 3 |  |
Fair Value Measurement [Line Items] |  |
Cash and cash equivalents | 0 | $ 0
Marketable securities classified as available-for-sale |  |
Level 3 | Restricted Assets |  |
Fair Value Measurement [Line Items] |  |
Restricted cash and cash equivalents | 0 | $ 0
Other restricted assets | 0 | 0
Restricted investments classified as held-to-maturity | $ 0 | $ 0

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- Definition Amount of debt 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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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