Pension and Other Post Retirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 55	$ 73	$ 131
Interest cost	3,087	3,235	2,670
Expected return on plan assets	(4,471)	(4,467)	(4,265)
Amortization of prior service costs	64	81	25
Amortization of net loss	1,722	478	2,131
Net periodic pension (benefit) cost	$ 457	$ (600)	$ 692