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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit cost for the Defined Benefit Pension Plan were as follows (in thousands):
Three Months Ended March 31,
20212020
Service cost$1,259 $1,353 
Interest cost2,328 3,357 
Expected return on plan assets(5,219)(5,648)
Net loss (gain)1,829 2,093 
Net periodic benefit cost$197 $1,155 

Defined Benefit Postretirement Healthcare Plan

The components of net periodic benefit cost for the Defined Benefit Postretirement Healthcare Plan were as follows (in thousands):
Three Months Ended March 31,
20212020
Service cost$559 $514 
Interest cost265 412 
Expected return on plan assets(34)(45)
Prior service cost (benefit)(109)(137)
Net loss (gain)117 5 
Net periodic benefit cost$798 $749 
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans

The components of net periodic benefit cost for the Supplemental Non-qualified Defined Benefit and Defined Contribution Plans were as follows (in thousands):
Three Months Ended March 31,
20212020
Service cost$693 $(1,370)
Interest cost177 275 
Net loss (gain)439 426 
Net periodic benefit cost$1,309 $(669)
Schedule of Defined Benefit Plans Contributions Contributions made in the first quarter of 2021 and anticipated contributions for 2021 and 2022 are as follows (in thousands):
Contributions MadeAdditional ContributionsContributions
Three Months Ended March 31, 2021Anticipated for 2021Anticipated for 2022
Defined Benefit Pension Plan$— $— $3,788 
Non-pension Defined Benefit Postretirement Healthcare Plan$1,382 $4,145 $5,241 
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans$482 $1,445 $1,967