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Employee Benefit Plans:
 9 Months Ended
Sep. 30, 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 September 30,Nine Months Ended September 30,
2021202020212020
Service cost$1,260 $1,352 $3,779 $4,058 
Interest cost2,328 3,356 6,984 10,069 
Expected return on plan assets(5,219)(5,647)(15,657)(16,943)
Net loss1,828 2,093 5,486 6,279 
Net periodic benefit cost$197 $1,154 $592 $3,463 

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 September 30,Nine Months Ended September 30,
2021202020212020
Service cost$560 $514 $1,678 $1,542 
Interest cost264 412 793 1,237 
Expected return on plan assets(34)(46)(102)(137)
Prior service cost (benefit)(108)(136)(326)(410)
Net loss116 5 350 15 
Net periodic benefit cost$798 $749 $2,393 $2,247 
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 September 30,Nine Months Ended September 30,
2021202020212020
Service cost$235 $1,035 $1,948 $1,482 
Interest cost176 274 530 824 
Prior service cost— 1 — 1 
Net loss439 425 1,316 1,277 
Net periodic benefit cost$850 $1,735 $3,794 $3,584 

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 nine months of 2021 and anticipated contributions for 2021 and 2022 are as follows (in thousands):
Contributions MadeAdditional ContributionsContributions
Nine Months Ended September 30, 2021Anticipated for 2021Anticipated for 2022
Defined Benefit Pension Plan$— $— $3,900 
Non-pension Defined Benefit Postretirement Healthcare Plan$4,145 $1,382 $5,202 
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans$1,445 $482 $2,149