Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 87	$ 65	$ 259	$ 195
Interest cost	124	151	373	453
Net periodic benefit cost	$ 211	$ 216	$ 632	$ 648