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COMMITMENTS AND CONTINGENCIES (Details) - Self Insurance
 12 Months Ended
Dec. 31, 2015
USD ($)
COMMITMENTS AND CONTINGENCIES  
Liability retention for self-insured individual health care claims $ 250,000
Maximum annual liability per insured 250,000
Minimum amount of claims for computation of variable portion of maximum liability for health plan per insured per year $ 250,000
Variable portion of maximum annual liability per insured (as a percent) 10.00%
Maximum liability for workers' compensation under stop-loss agreement per claim $ 500,000