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Employee Benefit Plans - Qualified Pension Plan - Narrative (Details) - Pension plans - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans
Fair value of qualified plan assets	$ 0	$ 0
Benefit obligations Plan assets	0	0	$ 0
Pension liabilities	$ 0	$ 0	$ 0

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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