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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Components of Pension Cost for Defined Benefit Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Components of Pension Cost for Defined Benefit Plan |  |  |  |
Defined benefit plans | [1] | $ 1,575 | $ (2,787) | $ (502)
Defined contribution plans |  | 22,593 | 24,835 | 26,477
Foreign Plan [Member] |  |  |  |
Components of Pension Cost for Defined Benefit Plan |  |  |  |
Service cost |  | 3,140 | 2,908 | 3,252
Interest cost |  | 2,755 | 3,739 | 3,703
Expected return on plan assets |  | (4,217) | (4,430) | (5,057)
Amortization of prior service cost |  | 57 | 58 | 1
Amortization of net loss |  | 1,986 | 2,296 | 2,211
Settlement charges | [2] | (237) | (266) | 397
Defined benefit plans |  | 3,958 | 4,837 | 3,713
United States |  |  |  |
Components of Pension Cost for Defined Benefit Plan |  |  |  |
Service cost |  | 156 | 140 | 139
Interest cost |  | 14,670 | 18,610 | 18,084
Expected return on plan assets |  | (23,377) | (24,980) | (27,052)
Amortization of net loss |  | 1,346 | 1,654 | 1,498
Settlement charges | [2] | (8,118) |  | (6,686)
Defined benefit plans |  | $ 913 | $ (4,576) | $ (645)
[1] | Other components of net periodic pension (cost) income includes pension settlements and curtailments. Refer to Note 12 to the consolidated financial statements for details.
[2] | Pension settlement charges resulting from lump sum pension payments.

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