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Employee Benefit Plans, Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets (Details) - Defined Benefit Pension Plans Combined [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Projected Benefit Obligation and Fair Value of Plan Assets [Abstract]
Projected benefit obligation	$ 54,106	$ 47,530	$ 41,511
Fair value of plan assets	56,315	49,349	40,624
Accumulated Benefit Obligation and Fair Value of Plan Assets [Abstract]
Accumulated benefit obligation	50,578	44,587
Fair value of plan assets	$ 56,315	$ 49,349	$ 40,624

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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