Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 588	$ 604	$ 772
Interest cost	1,694	1,758	1,723
Expected return on plan assets	(119)	(174)	(180)
Past service cost/(income) and other adjustments	0	253	145
Net periodic pension cost	$ 2,163	$ 2,441	$ 2,460