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Defined Benefit Plans
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Defined Benefit Plans Defined Benefit Plans
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)
Our non-qualified defined benefit pension plan is not funded. No contributions to the qualified defined benefit pension plan were made during the six months ended June 30, 2021. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2021.