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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2015	Dec. 26, 2014
Workers' Compensation Commitments [Line Items]
Cash collateral held by insurance carriers	$ 22,217	$ 22,639
Cash and cash equivalents held in Trust	31,227	43,856
Investments held in Trust	116,319	90,095
Letters of credit	4,240	6,513
Surety bonds	16,971	16,861
Total collateral commitments	$ 190,974	$ 179,964
Surety bonds annual fee limit, % of bond amount	2.00%
Surety bonds required cancellation notice	60 days
Minimum
Workers' Compensation Commitments [Line Items]
Surety bonds review and renewal period if elected	1 year
Maximum
Workers' Compensation Commitments [Line Items]
Surety bonds review and renewal period if elected	4 years

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- Definition

Cash collateral held by insurance carriers as of the reporting date for workers' compensation obligations for which the insurance carriers become responsible should we become insolvent.

+ References

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Collateral Commitments, Letters of Credit

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- Definition

Maximum fee percentage on bond amount for surety bonds issued by independent insurance companies on our behalf.

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The total amount of surety bonds issued by independent insurance companies on our behalf as of the reporting date.

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The minimum time requirement for notification of cancellation for a surety bond.

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The period of time in which the terms of surety bonds are subject to review and renewal.

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Total collateral commitments required by insurance carriers as of the reporting date for workers' compensation obligations for which the insurance carriers become responsible should we become insolvent.

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Workers' Compensation Commitments [Line Items]

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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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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