Segment Data, Operating Results by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue		$ 3,265,876	$ 3,091,640	$ 2,784,754
Costs of sales and operating expenses		2,200,354	2,180,422	2,060,941
Taxes, other than on income		34,910	34,766	35,071
Depreciation and amortization		240,322	211,156	201,443
Earnings before taxes on income		362,763	294,125	164,975
General corporate expenses		(18,785)	(23,341)	(18,614)
Impairments		(56,303)	0	0
Gain on disposition of assets		2,207	5,009	8,279
Operating income		399,097	335,092	192,886
Other income		12,795	11,041	16,677
Interest expense		(49,129)	(52,008)	(44,588)
Capital expenditures		342,660	401,730	172,606
Total assets		5,851,952	5,722,197
Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		3,265,876	3,091,640	2,784,754
Costs of sales and operating expenses		2,196,802	2,177,431	2,060,281
Administrative payroll expense		166,090	164,881	152,817
Taxes, other than on income		34,805	34,653	34,943
Depreciation and amortization		232,795	204,067	194,327
Other segment items	[1]	163,406	157,184	139,165
Earnings before taxes on income		471,978	353,424	203,221
Depreciation and amortization		240,322	211,156	201,443
Capital expenditures		342,660	401,730	172,606
Total assets		5,851,952	5,722,197
KMT [Member]
Segment Reporting Information [Line Items]
Revenue		1,913,050	1,721,937	1,616,967
KMT [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		1,913,050	1,721,937	1,616,967
Costs of sales and operating expenses		1,188,794	1,136,526	1,146,657
Administrative payroll expense		76,578	75,829	71,054
Taxes, other than on income		26,476	27,602	28,235
Depreciation and amortization		197,347	184,225	177,551
Other segment items	[1]	60,479	58,812	57,286
Earnings before taxes on income		363,376	238,943	136,184
Depreciation and amortization		197,347	184,225	177,551
Capital expenditures		247,768	255,411	147,170
Total assets		4,578,616	4,454,931
Distribution and Services Segment [Member]
Segment Reporting Information [Line Items]
Revenue		1,352,826	1,369,703	1,167,787
Distribution and Services Segment [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		1,352,826	1,369,703	1,167,787
Costs of sales and operating expenses		1,008,008	1,040,905	913,624
Administrative payroll expense		89,512	89,052	81,763
Taxes, other than on income		8,329	7,051	6,708
Depreciation and amortization		35,448	19,842	16,776
Other segment items	[1]	102,927	98,372	81,879
Earnings before taxes on income		108,602	114,481	67,037
Depreciation and amortization		35,448	19,842	16,776
Capital expenditures		85,437	140,769	21,713
Total assets		1,115,781	1,156,384
Other [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization		7,527	7,089	7,116
Capital expenditures		9,455	5,550	$ 3,723
Total assets		$ 157,555	$ 110,882

[1] Other segment items for each reportable segment includes: KMT – selling expense, professional service expense, occupancy expense, and certain overhead expenses. KDS – inventory-related expense, warranty expense, selling expense, professional service expense, occupancy expense, and certain overhead expenses.