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

Held-to-maturity Securities, Adjustments for Fair Value Calculation [Abstract]

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Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of investments in debt securities classified as held-to-maturity.

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Other long-term assets not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions.

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The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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