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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, 2017 | Dec. 31, 2016
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United States Pension Plan of US Entity [Member] |  |
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |
Projected benefit obligation | $ 26,149 | $ 25,731
Accumulated benefit obligation | 25,870 | 25,460
Fair value of plan assets | 5,977 | 5,548
Foreign Pension Plan [Member] |  |
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |
Projected benefit obligation | 182,512 | 47,776
Accumulated benefit obligation | 174,667 | 45,128
Fair value of plan assets | $ 102,107 | $ 38,200

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