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Employee Benefit Plans:
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
Components of Net Periodic Expense

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 
Plan Contributions

Contributions to the Defined Benefit Pension Plan are cash contributions made directly to the Pension Plan Trust account. Contributions to the Postretirement Healthcare and Supplemental Plans are made in the form of benefit payments. 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