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Employee Benefit Plans: Plan Contributions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	$ 0
Payment for Pension Benefits	0
Estimated Future Employer Contributions in Current Fiscal Year	0
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	4,808
Payment for Pension Benefits	2,460
Estimated Future Employer Contributions in Current Fiscal Year	2,460
Supplemental Non-Qualified Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	2,417
Payment for Pension Benefits	1,116
Estimated Future Employer Contributions in Current Fiscal Year	$ 1,116

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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