FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of Rabbi Trusts established | item	2
Net gains (losses) of the Rabbi Trust investments	$ (998)	$ 2,844
Unrealized net gains (losses) of the Rabbi Trust investments	$ (990)	$ 2,885