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WORKERS' COMPENSATION INSURANCE AND RESERVES -Estimated future payout (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Workers' Compensation Insurance and Reserves [Abstract]    
2019 $ 76,421  
2020 41,654  
2021 23,690  
2022 15,236  
2023 10,309  
Thereafter 50,907  
Sub-total 218,217  
Excess claims 48,229 $ 48,800
Total $ 266,446