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Net Periodic Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Net periodic pension cost for the Company’s defined benefit pension plans and U.S. post-retirement medical plan includes the following components for the three months ended June 30:
 U.S. Pension BenefitsNon-U.S. Pension BenefitsOther U.S. Post-retirement BenefitsTotal
 20212020202120202021202020212020
Service cost, net$374 $326 $4,907 $4,528 $— $— $5,281 $4,854 
Interest cost on projected benefit obligations
549 889 858 1,097 1,409 1,993 
Expected return on plan assets(1,494)(1,524)(8,904)(8,017)— — (10,398)(9,541)
Recognition of prior service cost
— — (465)(1,735)(19)(19)(484)(1,754)
Recognition of actuarial losses/(gains)
729 645 6,246 5,712 (9)(7)6,966 6,350 
Net periodic pension cost/(credit)
$158 $336 $2,642 $1,585 $(26)$(19)$2,774 $1,902 

Net periodic pension cost for the Company’s defined benefit pension plans and U.S. post-retirement medical plan includes the following components for the six months ended June 30:
 U.S. Pension BenefitsNon-U.S. Pension BenefitsOther U.S. Post-retirement BenefitsTotal
 20212020202120202021202020212020
Service cost, net$748 $652 $9,852 $9,045 $— $— $10,600 $9,697 
Interest cost on projected benefit obligations
1,098 1,778 1,708 2,332 14 2,810 4,124 
Expected return on plan assets(2,988)(3,048)(17,875)(16,104)— — (20,863)(19,152)
Recognition of prior service cost— — (936)(3,460)(38)(38)(974)(3,498)
Recognition of actuarial losses/(gains)1,458 1,290 12,545 11,311 (18)(14)13,985 12,587 
Net periodic pension cost/(credit)$316 $672 $5,294 $3,124 $(52)$(38)$5,558 $3,758