Employee and Retiree Benefit Plans - Projected Benefit Obligations, Accumulated Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Funded plan \| Qualified plan
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligations	$ 734,375	$ 762,134
Accumulated Benefit Obligations	723,887	753,475
Fair Value of Plan Assets	589,529	564,238
Unfunded plan \| Other postretirement plans
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligations	96,133	108,378
Accumulated Benefit Obligations	96,133	108,378
Fair Value of Plan Assets	0	0
Unfunded plan \| Nonqualified plan
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligations	188,713	201,372
Accumulated Benefit Obligations	188,530	198,792
Fair Value of Plan Assets	$ 0	$ 0

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 50
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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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