FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Thousands |
6 Months Ended | |
---|---|---|
Jun. 30, 2019
USD ($)
item
|
Jun. 30, 2018
USD ($)
|
|
FAIR VALUE MEASUREMENTS [Abstract] | ||
Number of Rabbi Trusts established | item | 2 | |
Net gains (losses) of the Rabbi Trust investments | $ 2,844 | $ (428) |
Unrealized net gains (losses) of the Rabbi Trust investments | $ 2,885 | $ (430) |