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WORKERS' COMPENSATION INSURANCE AND RESERVES - Reconciliation of Workers' Compensation Claims Reserve (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 27, 2014
Dec. 27, 2013
Workers' Compensation Deductible Limit [Line Items]    
Undiscounted workers’ compensation reserve $ 232,437 $ 234,453
Less discount on workers' compensation reserve 18,400 19,624
Workers' compensation reserve, net of discount 214,037 214,829
Less current portion 48,951 49,942
Long-term portion $ 165,086 $ 164,887