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Employee Benefit Plans:
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
Defined Benefit Pension Plan

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)

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 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