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Pension Plans and Other Postretirement Benefit Plans - Schedule of Fair Value Hierarchy of Other Postretirement Plan Assets (Details) - Other Postretirement Benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 52,173	$ 44,853	$ 36,852
Mutual Fund [Member] \| Balanced Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	52,173	44,853
Level 1 [Member] \| Mutual Fund [Member] \| Balanced Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 52,173	$ 44,853

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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