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Employee Benefit Plans - Defined Benefit Plans Located within Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 403,500	$ 351,800
Benefit obligation	558,400	509,400
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	378,900	331,400
Benefit obligation	470,100	439,400
Pension Plan \| Other assets, net
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58,410	25,469
Pension Plan \| Other current liabilities
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	19,432	12,144
Pension Plan \| Other liabilities
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 135,440	$ 145,432

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.

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