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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

X

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