Pension - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Service cost		$ 192
Interest cost	$ 168	260
Expected return on plan assets	(154)	(232)
Amortization of prior service cost		(25)
Amortization of actuarial loss		15
Net periodic pension cost	$ 14	$ 210