Deferred Compensation Benefits - Deferred Compensation Benefits Change in Benefit Obligation and Reconciliation of Fair Value (Details) - ESBP, NDBP, BDBP, FDBP and SDBP [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in Benefit Obligation
Benefit obligation at beginning of period	$ 34,729	$ 30,629
Service cost	499	428
Interest cost	197	355
Benefits paid	(1,036)	(996)
Acquisition		22
Actuarial loss	(1,341)	1,733
Effect of exchange rate changes	(2,091)	2,558
Benefit obligation at end of period	30,957	34,729
Reconciliation of Fair Value of Plan Assets
Fair value of plan assets at beginning of period	20,656	18,079
Actual return on plan assets	636	603
Employer contributions	1,199	1,188
Benefits paid	(922)	(968)
Effect of exchange rate changes	(1,591)	1,754
Fair value of plan assets at end of period	19,978	20,656
Accrued benefit cost	$ 10,979	$ 14,073