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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Jun. 24, 2016 | Dec. 25, 2015
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |
Cash collateral held by insurance carriers | $ 26,438 | $ 23,634
Cash and cash equivalents held in Trust | 25,205 | 26,046
Investments held in Trust | 138,391 | 126,788
Other | 14,320 | 11,944
Restricted cash and investments | 204,354 | 188,412
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 4,165 | 1,644
Gross Unrealized Loss | (3) | (187)
Fair Value | 142,553 | 128,245
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 142,553 | 128,245
Municipal debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 65,231 | 67,948
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 2,587 | 1,345
Gross Unrealized Loss | 0 | (4)
Fair Value | 67,818 | 69,289
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 67,818 | 69,289
Corporate debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 66,007 | 50,462
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 1,461 | 226
Gross Unrealized Loss | (2) | (152)
Fair Value | 67,466 | 50,536
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 67,466 | 50,536
Agency mortgage-backed securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 7,153 | 8,378
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 117 | 73
Gross Unrealized Loss | (1) | (31)
Fair Value | 7,269 | 8,420
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 7,269 | $ 8,420
Restricted Cash and Investments |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 138,391 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Fair Value | 142,553 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Due in one year or less | 16,580 |
Due after one year through five years | 68,592 |
Due after five years through ten years | 53,219 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Due in one year or less | 16,649 |
Due after one year through five years | 69,916 |
Due after five years through ten years | 55,988 |
Fair Value | $ 142,553 |

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