SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Liabilities Under Self-Insurance Program) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Self-insured liabilities (undiscounted)	$ 68,912	$ 58,216
Insured liabilities (undiscounted)	$ 4,377	$ 7,892
Discount Rate	2.93%	1.93%
Other accounts and notes receivables	$ 631	$ 6,158
Investments and long-term receivables	3,932	7,246
Other current liabilities	(18,466)	(20,036)
Other noncurrent liabilities	(48,049)	(41,792)
Net liabilities (discounted)	$ (61,952)	$ (48,424)