Retirement Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Settlements and curtailments	$ (2,500)	$ 1,400
United States [Member]
Interest cost	2,100	2,500
Expected return on plan assets	(3,100)	(3,300)
Amortization of net actuarial loss	400	300
Net periodic pension cost (credit)	(600)	(500)
Settlements and curtailments		1,100
Total pension cost	(600)	600
Foreign Plan [Member]
Interest cost	400	400
Expected return on plan assets	(600)	(600)
Amortization of net actuarial loss	300	400
Net periodic pension cost (credit)	100	200
Settlements and curtailments
Total pension cost	$ 100	$ 200