RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
United States
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Projected benefit obligation	$ 14,794	$ 14,653
Accumulated benefit obligation	14,521	14,406
Fair value of plan assets	0	0
Foreign Plan [Member]
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Projected benefit obligation	169,455	158,746
Accumulated benefit obligation	164,203	152,724
Fair value of plan assets	$ 98,434	$ 90,076