Retirement Plans, Defined Contribution Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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	$ 8,200	$ 7,800	$ 6,700
Pension Plan [Member]
Benefit obligation [Roll Forward]
Benefit obligation at beginning of year	32,367	41,780
Service cost	1,741	1,622	1,740
Interest cost	1,886	953	851
Foreign currency exchange rate changes	999	(1,488)
Benefits and settlements paid	(2,737)	(1,724)
Actuarial loss (gain)	2,157	(8,776)
Benefit obligation at end of year	36,413	32,367	41,780
Change in fair value of plan assets [Roll Forward]
Plan assets at beginning of year	19,929	32,982
Company contributions	1,598	1,027
Foreign currency exchange rate changes	920	(2,430)
Benefits paid	(2,737)	(1,724)
Actual gain (loss) on plan assets	1,560	(9,926)
Plan assets at end of year	21,270	19,929	32,982
Funded status	(15,143)	(12,438)
Accumulated benefit obligation	34,786	31,472
Amounts recognized in Consolidated Balance Sheets [Abstract]
Accrued employee and retiree benefits	(19,165)	(16,822)
Other accrued expenses	(726)	(745)
Other assets	4,748	5,129
Net liability	(15,143)	(12,438)
Components of annual benefit cost [Abstract]
Service cost	1,741	1,622	1,740
Interest cost	1,886	953	851
Expected return on plan assets	(1,007)	(785)	(728)
Recognized actuarial (gain) loss	(656)	32	267
Settlement income	0	0	(151)
Defined benefit expense	$ 1,964	$ 1,822	$ 1,979
Weighted average liability assumptions [Abstract]
Discount rate	5.15%	5.12%
Expected return on plan assets	4.91%	4.89%
Rate of compensation increase	1.14%	0.90%
Weighted average cost assumption [Abstract]
Discount rate	5.12%	2.35%	1.87%
Expected return on plan assets	4.89%	2.54%	2.17%
Rate of compensation increase	0.90%	1.02%	1.07%
Estimated Future Benefit Payments [Abstract]
2024	$ 2,000
2025	9,200
2026	2,000
2027	2,000
2028	2,100
2029 through 2033	13,200
Estimated future employer contributions for next fiscal year	700
Amounts recognized in Accumulated Other Comprehensive Loss [Abstract]
Unrecognized net actuarial loss	2,936	$ 2,210
Prior service cost	155	153
Total before tax effects	3,091	2,363
Other Comprehensive Income (Loss), Pension Adjustment, Net of Tax [Abstract]
Net actuarial gain (loss) arising during the period	192	(1,466)	$ 1,528
Amortization of actuarial (gain) loss, included in defined benefit expense	(479)	27	84
Pension adjustment, net of tax	$ (287)	$ (1,439)	$ 1,612