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Employee Benefit Plans - Pension plans with accumulated benefit obligation in excess of assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 603,309	$ 637,165
Projected benefit obligation	603,309	637,165	$ 593,591
Fair value of plan assets	517,148	492,827	420,699
SERPs
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	18,023	18,890
Projected benefit obligation	18,023	18,890	18,541
Fair value of plan assets	$ 0	$ 0	$ 0

X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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-Publisher FASB
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-Topic 715
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+ References

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-SubTopic 20
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