Pension and Other Post Retirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Service cost	$ 16	$ 39	$ 8
Interest cost	2,343	2,975	2,816
Expected return on plan assets	(4,086)	(4,414)	(4,891)
Amortization of prior service cost	87	87	87
Amortization of net loss	221	404	287
Net periodic pension benefit cost	$ (1,419)	$ (909)	$ (1,693)