Employee Benefits - Components of Net Periodic Pension Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	$ 4,511	$ 4,421	$ 3,659
Interest cost	605	718	851
Expected return on plan assets	(350)	(493)	(517)
Recognition of actuarial loss	576	474	237
Recognition of loss due to settlements	286	0	0
Total defined benefit pension expense	$ 5,628	$ 5,120	$ 4,230