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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 26, 2015
Dec. 26, 2014
Workers' Compensation Commitments [Line Items]    
Cash collateral held by insurance carriers $ 22,305 $ 22,639
Cash and cash equivalents held in Trust 34,057 43,856
Investments held in Trust 94,598 90,095
Letters of credit [1] 6,731 6,513
Surety bonds [2] 16,905 16,861
Total collateral commitments 174,596 179,964
Cash collateral backing letters of credit $ 1,864 $ 1,864
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  
[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 June 26, 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.