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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 23, 2016
Dec. 25, 2015
Workers' Compensation Commitments [Line Items]    
Cash collateral held by workers' compensation insurance carriers $ 26,532 $ 23,133
Cash and cash equivalents held in Trust 21,101 26,046
Investments held in Trust 148,811 126,788
Letters of credit [1] 4,520 4,520
Surety bonds [2] 19,327 17,946
Total collateral commitments $ 220,291 $ 198,433
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.
[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.