Retirement Plans, Defined Contribution Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan [Member]
Defined Contribution Pension and Other Postretirement Benefit Expense [Abstract]
Percentage of matching contributions under defined contribution plan	4.00%
Total expense for defined contribution plans	$ 6,700	$ 6,100	$ 6,000
Pension Plan [Member]
Benefit obligation [Roll Forward]
Benefit obligation at beginning of year	45,631	39,421
Service cost	1,740	1,601	1,432
Interest cost	851	1,022	1,273
Foreign currency exchange rate changes	(291)	690
Benefits and settlements paid	(3,298)	(1,948)
Amendments	0	42
Actuarial (gain) loss	(2,853)	4,803
Benefit obligation at end of year	41,780	45,631	39,421
Change in fair value of plan assets [Roll Forward]
Plan assets at beginning of year	35,676	31,776
Company contributions	947	1,117
Foreign currency exchange rate changes	(297)	882
Benefits paid	(1,718)	(1,948)
Settlement payments	(1,580)	0
Actual (loss) gain on plan assets	(46)	3,849
Plan assets at end of year	32,982	35,676	31,776
Funded status	(8,798)	(9,955)
Accumulated benefit obligation	40,873	44,559
Amounts recognized in Consolidated Balance Sheets [Abstract]
Accrued employee and retiree benefits	(18,375)	(19,349)
Other accrued expenses	(693)	(722)
Other assets	10,270	10,116
Net liability	(8,798)	(9,955)
Components of annual benefit cost [Abstract]
Service cost	1,740	1,601	1,432
Interest cost	851	1,022	1,273
Expected return on plan assets	(728)	(813)	(896)
Recognized actuarial loss (gain)	267	41	(176)
Settlement income	(151)	0	0
Defined benefit expense	$ 1,979	$ 1,851	$ 1,633
Weighted average liability assumptions [Abstract]
Discount rate	2.35%	1.87%
Expected return on plan assets	2.54%	2.17%
Rate of compensation increase	0.27%	0.34%
Weighted average cost assumption [Abstract]
Discount rate	1.87%	2.69%	3.80%
Expected return on plan assets	2.17%	2.68%	3.21%
Rate of compensation increase	0.34%	0.34%	0.31%
Estimated Future Benefit Payments [Abstract]
2022	$ 1,700
2023	3,800
2024	3,900
2025	1,700
2026	4,800
2027 through 2031	10,600
Estimated future employer contributions for next fiscal year	700
Amounts recognized in Accumulated Other Comprehensive Loss [Abstract]
Unrecognized net actuarial loss	221	$ 2,402
Prior service cost	179	187
Total before tax effects	400	2,589
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract]
Net actuarial gain (loss) arising during the period	1,528	(1,293)	$ (1,091)
Prior service cost	0	(32)	0
Amortization of actuarial loss (gain), included in defined benefit expense	84	32	(130)
Pension adjustment, net of tax	$ 1,612	$ (1,293)	$ (1,221)