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Employee Benefit Plans:
6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2021202020212020
Service cost$1,260 $1,353 $2,519 $2,706 
Interest cost2,328 3,356 4,656 6,713 
Expected return on plan assets(5,219)(5,648)(10,438)(11,296)
Net loss1,829 2,093 3,658 4,186 
Net periodic benefit cost$198 $1,154 $395 $2,309 

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 June 30,Six Months Ended June 30,
2021202020212020
Service cost$559 $514 $1,118 $1,028 
Interest cost264 413 529 825 
Expected return on plan assets(34)(46)(68)(91)
Prior service cost (benefit)(109)(137)(218)(274)
Net loss117 234 10 
Net periodic benefit cost$797 $749 $1,595 $1,498 
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 June 30,Six Months Ended June 30,
2021202020212020
Service cost$1,020 $1,817 $1,713 $447 
Interest cost177 275 354 550 
Net loss438 426 877 852 
Net periodic benefit cost$1,635 $2,518 $2,944 $1,849 

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 six months of 2021 and anticipated contributions for 2021 and 2022 are as follows (in thousands):
Contributions MadeAdditional ContributionsContributions
Six Months Ended June 30, 2021Anticipated for 2021Anticipated for 2022
Defined Benefit Pension Plan$— $— $3,788 
Non-pension Defined Benefit Postretirement Healthcare Plan$2,763 $2,763 $5,241 
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans$964 $964 $1,967