SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Liabilities Under Self-Insurance Program) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Self-insured liabilities (undiscounted)	$ 44,618	$ 43,731
Insured liabilities (undiscounted)	$ 16,787	$ 17,758
Discount Rate	1.44%	1.29%
Investments and long-term receivables	$ 15,810	$ 16,884
Other accrued liabilities	(14,198)	(13,131)
Other noncurrent liabilities	(44,102)	(45,569)
Net liabilities (discounted)	$ (42,490)	$ (41,816)