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Defined Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Net Periodic Cost (Benefit)
The components of the combined net periodic expense (benefit) for our defined benefit pension plans are presented in the table below.
Three Months Ended
June 30,
Six Months Ended
June 30,
2021202020212020
Expected return on plan assets, net of expenses$(3,210)$(3,072)$(6,420)$(6,144)
Interest cost on projected benefit obligation836 1,253 1,671 2,505 
Net amortization and deferral1,529 1,329 3,058 2,659 
Net periodic expense (benefit)$(845)$(490)$(1,691)$(980)