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Pension and Other Post Retirement Benefit Plans - Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Net periodic pension benefit cost	$ (1,419)	$ (909)	$ (1,693)
Net gain (loss)	(3,119)	4,552	(2,189)
Amortization of net loss	221	404	287
Amortization of prior service cost	87	87	87
Total recognized in other comprehensive income (loss)	(2,811)	5,043	(1,815)
Total recognized in net periodic pension benefit cost and other comprehensive income (loss)	$ (1,392)	$ 5,952	$ (122)

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Other Comprehensive Income (Loss), Defined Benefit Plan, Amortization Cost (Credit), before Tax

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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