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Defined Benefit Plans (Tables)
3 Months Ended
Mar. 31, 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
March 31,
20212020
Expected return on plan assets, net of expenses$(3,210)$(3,072)
Interest cost on projected benefit obligation835 1,252 
Net amortization and deferral1,529 1,330 
Net periodic expense (benefit)$(846)$(490)