Employee Benefits - Rollforward of Defined Benefit Pension Plans Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Pension plan assets at the beginning of the year	$ 19,460	$ 18,475	$ 14,465
Company contributions	4,405	4,478	3,438
Benefit payments	(830)	(1,400)	(1,780)
Actual return on plan assets	714	(164)	547
Contractual termination benefits	0	(950)	0
Foreign currency impact	(305)	(979)	1,805
Pension plan assets at the end of the year	$ 23,444	$ 19,460	$ 18,475