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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic expense were as follows (in thousands):

Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit PlansNon-pension Defined Benefit Postretirement Healthcare Plan
Three Months Ended March 31,202220212022202120222021
Service cost$982 $1,259 $(392)$693 $492 $559 
Interest cost2,705 2,328 208 177 321 265 
Expected return on plan assets(4,631)(5,219)— — (31)(34)
Net amortization of prior service costs(17)— — — (72)(109)
Recognized net actuarial loss1,523 1,829 69 439 16 117 
Net periodic expense (benefit)$562 $197 $(115)$1,309 $726 $798 
Schedule of Defined Benefit Plans Contributions Contributions made in the first three months of 2022 and anticipated contributions for 2022 and 2023 are as follows (in thousands):
Contributions MadeAdditional ContributionsContributions
Three Months Ended March 31, 2022Anticipated for 2022Anticipated for 2023
Defined Benefit Pension Plan$— $3,900 $3,200 
Non-pension Defined Benefit Postretirement Healthcare Plan$1,276 $3,828 $4,761 
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans$539 $1,617 $2,215