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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Liabilities Under Self-Insurance Program) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]    
Self-insured liabilities (undiscounted) $ 69,069 $ 68,912
Insured liabilities (undiscounted) $ 6,431 $ 4,377
Discount rate 1.63% 2.93%
Other accounts and notes receivable $ 0 $ 631
Investments and long-term receivables 5,931 3,932
Other current liabilities (19,830) (18,466)
Other noncurrent liabilities (51,360) (48,049)
Net liabilities (discounted) $ (65,259) $ (61,952)