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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.