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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Self-insured Insurance and Medical Claims (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Self-insured Insurance and Medical Claims [Abstract]    
Workers compensation insurance reserves, per claim $ 100,000  
Medical insurance reserves, per claim $ 175,000  
Maximum retention percentage of employee higher risk claims 0.05%  
Accrual for claims $ 3,100,000 $ 3,400,000