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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 27, 2015 | Dec. 26, 2014
Workers' Compensation Commitments [Line Items] |  |  |  |
Cash collateral held by insurance carriers | $ 22,497 tbi_CollateralCommitmentsCashCollateralHeldByInsuranceCarriers |  | $ 22,639 tbi_CollateralCommitmentsCashCollateralHeldByInsuranceCarriers |
Cash and cash equivalents held in Trust | 51,066 tbi_CollateralCommitmentsCashAndCashEquivalentsHeldInTrust |  | 43,856 tbi_CollateralCommitmentsCashAndCashEquivalentsHeldInTrust |
Investments held in Trust | 85,351 us-gaap_HeldToMaturitySecurities |  | 90,095 us-gaap_HeldToMaturitySecurities |
Letters of credit | 6,787 tbi_CollateralCommitmentsLettersofCredit | [1] | 6,513 tbi_CollateralCommitmentsLettersofCredit | [1]
Surety bonds | 16,861 tbi_CollateralCommitmentsSuretyBonds | [2] | 16,861 tbi_CollateralCommitmentsSuretyBonds | [2]
Total collateral commitments | 182,562 tbi_CollateralCommitmentsTotalCollateralCommitments |  | 179,964 tbi_CollateralCommitmentsTotalCollateralCommitments |
Cash collateral backing letters of credit | $ 1,864 tbi_CollateralCommitmentsCashCollateralForLettersOfCredit |  | $ 1,864 tbi_CollateralCommitmentsCashCollateralForLettersOfCredit |
Surety bonds annual fee limit, % of bond amount | 2.00%tbi_CollateralCommitmentsSuretyBondAnnualFeeLimitPercentageOfBondAmount |  |  |
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 |  |  |
[1] | We have agreements with certain financial institutions to issue letters of credit as collateral. We had $1.9 million of restricted cash collateralizing our letters of credit at March 27, 2015 and December 26, 2014.
[2] | Our surety bonds are issued by independent insurance companies on our behalf and bear annual fees based on a percentage of the bond, which are determined by each independent surety carrier. These fees do not exceed 2.0% of the bond amount, subject to a minimum charge. The terms of these bonds are subject to review and renewal every one to four years and most bonds can be canceled by the sureties with as little as 60 days' notice.

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