SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Liabilities Under Self-Insurance Program) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Self-insured liabilities (undiscounted)	$ 58,216	$ 49,310
Insured liabilities (undiscounted)	$ 7,892	$ 72,644
Discount Rate	1.93%	1.40%
Other accounts and notes receivables	$ 6,158	$ 67,631
Investments and long-term receivables	7,246	16,133
Other current liabilities	(20,036)	(69,549)
Other noncurrent liabilities	(41,792)	(49,074)
Net liabilities (discounted)	$ (48,424)	$ (34,859)