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Employee Benefit Plans:
 6 Months Ended
Jun. 30, 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 June 30,202220212022202120222021
Net Service cost$982 $1,260 $(1,355)$1,020 $492 $559 
Interest cost2,704 2,328 209 177 321 264 
Expected return on plan assets(4,630)(5,219)— — (31)(34)
Net amortization of prior service costs(17)— — — (73)(109)
Recognized net actuarial loss1,523 1,829 69 438 16 117 
Net periodic expense (benefit)$562 $198 $(1,077)$1,635 $725 $797 

Defined Benefit Pension PlanSupplemental Non-qualified Defined Benefit PlansNon-pension Defined Benefit Postretirement Healthcare Plan
Six Months Ended June 30,202220212022202120222021
Net Service cost$1,964 $2,519 $(1,747)$1,713 $984 $1,118 
Interest cost5,409 4,656 417 354 642 529 
Expected return on plan assets(9,261)(10,438)— — (62)(68)
Net amortization of prior service costs(34)— — — (145)(218)
Recognized net actuarial loss3,046 3,658 138 877 32 234 
Net periodic expense (benefit)$1,124 $395 $(1,192)$2,944 $1,451 $1,595 
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 six months of 2022 and anticipated contributions for 2022 and 2023 are as follows (in thousands):

Contributions MadeAdditional ContributionsContributions
Six Months Ended June 30, 2022Anticipated for 2022Anticipated for 2023
Defined Benefit Pension Plan$— $— $— 
Non-pension Defined Benefit Postretirement Healthcare Plan$2,552 $2,552 $4,761 
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans$1,078 $1,078 $2,215 

Funding Status of Employee Benefit Plans

Based on the fair value of assets and estimated discount rate used to value benefit obligations as of June 30, 2022, we estimate the unfunded status of our employee benefit plans to be approximately $29 million compared to $20 million at December 31, 2021. In 2012, we froze our pension plan and closed it to new participants. Since then, we have implemented various de-risking strategies including lump sum buyouts, the purchase of annuities and the reduction of return-seeking assets over time to a more liability-hedged portfolio. As a result, recent capital markets volatility has not materially affected our unfunded status and does not require interim re-measurement of our pension plan assets or defined benefit obligations.