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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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