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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 25, 2015 | Dec. 26, 2014
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |
Cash collateral held by insurance carriers | $ 23,634 | $ 22,639
Cash and cash equivalents held in Trust | 26,046 | 43,856
Investments held in Trust | 126,788 | 90,095
Other | 11,944 | 11,836
Restricted cash and investments | 188,412 | 168,426
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Amortized Cost | 126,788 | 90,095
Gross Unrealized Gain | 1,644 | 1,218
Gross Unrealized Loss | (187) | (247)
Fair Value | 128,245 | 91,066
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Amortized Cost | 126,788 | 90,095
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 128,245 | 91,066
Municipal debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 67,948 | 52,406
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Amortized Cost | 67,948 | 52,406
Gross Unrealized Gain | 1,345 | 882
Gross Unrealized Loss | (4) | (92)
Fair Value | 69,289 | 53,196
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Amortized Cost | 67,948 | 52,406
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 69,289 | 53,196
Corporate debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 50,462 | 27,715
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Amortized Cost | 50,462 | 27,715
Gross Unrealized Gain | 226 | 179
Gross Unrealized Loss | (152) | (144)
Fair Value | 50,536 | 27,750
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Amortized Cost | 50,462 | 27,715
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 50,536 | 27,750
Agency mortgage-backed securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 8,378 | 9,974
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Amortized Cost | 8,378 | 9,974
Gross Unrealized Gain | 73 | 157
Gross Unrealized Loss | (31) | (11)
Fair Value | 8,420 | 10,120
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Amortized Cost | 8,378 | 9,974
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 8,420 | $ 10,120
Restricted Cash and Investments |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 126,788 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Amortized Cost | 126,788 |
Fair Value | 128,245 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Due in one year or less | 11,441 |
Due after one year through five years | 55,986 |
Due after five years through ten years | 59,361 |
Amortized Cost | 126,788 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Due in one year or less | 11,504 |
Due after one year through five years | 56,253 |
Due after five years through ten years | 60,488 |
Fair Value | $ 128,245 |

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