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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Obligations and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in plan assets      
Balance at the beginning of year $ 695,224    
Balance at the end of year 735,082 $ 695,224  
United States      
Change in benefit obligations      
Benefit obligations at beginning of year 492,511 438,945  
Service cost 156 140 $ 139
Interest cost 14,670 18,610 18,084
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0 0  
Acquisitions 0 0  
Actuarial (gain) loss 100,346 58,842  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (10,105) (24,026)  
Settlement/curtailment [1] (39,632) 0  
Currency translation 0 0  
Benefit obligations at end of year $ 557,946 $ 492,511 438,945
Discount rate 2.20% 3.40%  
Change in plan assets      
Balance at the beginning of year $ 589,551 $ 512,078  
Actual return on plan assets 72,596 100,744  
Employer contributions 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0 0  
Acquisitions & other adjustments 0 0  
Benefits paid (8,875) (23,271)  
Settlement [1] (35,248) 0  
Currency translation 0 0  
Balance at the end of year 618,024 589,551 512,078
Net amount recognized      
Funded status at end of year 60,078 97,040  
Unrecognized actuarial net loss 108,873 67,050  
Unrecognized prior service cost 0 0  
Unrecognized transition assets, net 0 0  
Net amount recognized in the balance sheets 168,951 164,090  
Foreign Plan [Member]      
Change in benefit obligations      
Benefit obligations at beginning of year 176,858 168,811  
Service cost 3,140 2,908 3,252
Interest cost 2,755 3,739 3,703
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 142 153  
Acquisitions 11 (1,864)  
Actuarial (gain) loss 7,161 10,653  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (7,064) (8,961)  
Settlement/curtailment [1] (2,701) (1,256)  
Currency translation 9,839 2,675  
Benefit obligations at end of year $ 190,141 $ 176,858 168,811
Discount rate 1.30% 1.70%  
Change in plan assets      
Balance at the beginning of year $ 105,673 $ 100,187  
Actual return on plan assets 8,403 9,743  
Employer contributions 2,818 2,210  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 142 153  
Acquisitions & other adjustments   (2,651)  
Benefits paid (4,403) (6,120)  
Settlement [1] (633) (920)  
Currency translation 5,058 3,071  
Balance at the end of year 117,058 105,673 $ 100,187
Net amount recognized      
Funded status at end of year (73,083) (71,185)  
Unrecognized actuarial net loss 28,637 28,543  
Unrecognized prior service cost 389 457  
Unrecognized transition assets, net 27 30  
Net amount recognized in the balance sheets $ (44,030) $ (42,155)  
[1] Actuarial losses in 2020 were primarily the result of a decrease in the Company’s U.S. pension plan discount rate from 3.4% in 2019 to 2.2% in 2020.