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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
United States    
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets    
Projected benefit obligation $ 11,278 $ 14,794
Accumulated benefit obligation 10,887 14,521
Fair value of plan assets 0 0
Foreign Plan [Member]    
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets    
Projected benefit obligation 144,576 169,455
Accumulated benefit obligation 140,169 164,203
Fair value of plan assets $ 71,285 $ 98,434