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WORKERS' COMPENSATION INSURANCE AND RESERVES -Estimated future payout (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Workers' Compensation Insurance and Reserves [Abstract]    
2018 $ 76,536  
2019 42,611  
2020 24,429  
2021 15,227  
2022 10,187  
Thereafter 56,507  
Sub-total 225,497  
Excess claims 48,826 $ 52,900
Total $ 274,323