Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 86	$ 65	$ 172	$ 130
Interest cost	125	151	250	302
Net periodic benefit cost	$ 211	$ 216	$ 422	$ 432