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Pension Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Domestic and Foreign Pension and Postretirement Defined Benefit Plans
The components of pension and postretirement benefits cost (credit) for the three-month and six-month periods ended June 30, 2020 and 2019 were as follows (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Pension Benefits Cost (Credit):
Service cost$1,207  $1,123  $2,421  $2,253  
Interest cost6,666  8,220  13,353  16,540  
Expected return on assets(10,028) (9,445) (20,091) (18,897) 
Amortization of prior service benefit69  6  18  12  
Total net pension benefits credit$(2,086) $(96) $(4,299) $(92) 
Postretirement Benefits Cost:
Service cost$26  $25  $52  $49  
Interest cost467  549  935  1,098  
Total net postretirement benefits cost$493  $574  $987  $1,147  
Total net pension and postretirement benefits (credit) cost$(1,593) $478  $(3,312) $1,055