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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
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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

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