Pension and Other Post Retirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service cost	$ 8	$ 10	$ 9
Interest cost	2,816	3,353	3,273
Expected return on plan assets	(4,891)	(4,778)	(4,508)
Amortization of prior service cost	87	90	79
Amortization of net loss	287	1,218	1,656
Settlement loss recognized		761
Net periodic pension benefit cost	$ (1,693)	$ 654	$ 509