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Employee Benefit Plans - Pension Plans with Accumulated Benefit Obligation in Excess of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 637,165	$ 593,591
Projected benefit obligation	637,165	593,591	$ 544,581
Fair value of plan assets	492,827	420,699	361,891
SERPs
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	18,890	18,541
Projected benefit obligation	18,890	18,541	16,985
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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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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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+ References

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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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