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PENSION BENEFITS (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Defined Benefit Plans Disclosure
Net periodic pension benefit costs for the Company's significant defined benefit plans include the following components: 
 U.S. Plans
Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Service cost$27 $24 $53 $49 
Interest cost76 115 153 230 
Expected return on plan assets(305)(283)(610)(567)
Amortization of prior service (credit)(11)(10)(22)(21)
 $(213)$(154)$(426)$(309)

 Non-U.S. Plans
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Service cost$$$13 $11 
Interest cost21 26 40 52 
Expected return on plan assets(89)(81)(176)(165)
Amortization of prior service (credit)— — — — 
 $(62)$(50)$(123)$(102)