Business Combination (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	4 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2023
Business Acquisition [Line Items]
Depreciation				$ 70,374	$ 62,480	$ 65,130
Amortization of intangible assets				4,452	4,842
Total bank debt	$ 456,885	$ 456,885	$ 456,885	456,885	439,000
Current maturities of long-term debt	4,218	4,218	4,218	4,218	0
Cost of goods sold				724,191	645,105	550,849
Selling, general and administrative expenses				214,915	168,713	$ 160,127
Foreign Bank Debt
Business Acquisition [Line Items]
Total bank debt	10,885	10,885	10,885	10,885	0
Heimbach
Business Acquisition [Line Items]
Acquisition related costs				4,100
Property, plant and equipment							$ 125,117
Depreciation			4,000	4,000
Amortizable intangible assets							14,901
Amortization of intangible assets				300
Operating lease, right-of-use asset							3,400
Operating lease, liability							3,400
Operating lease, liability, current							1,200
Assumed debt							32,700
Pension liabilities							35,300
Revenue of acquiree since acquisition date, actual				51,200
Earnings (loss) of acquiree since acquisition date, actual		6,300		6,300
Heimbach | Fair Value Adjustment to Inventory
Business Acquisition [Line Items]
Cost of goods sold					$ 5,500
Heimbach | Acquisition-related Costs
Business Acquisition [Line Items]
Selling, general and administrative expenses				4,100
Heimbach | Foreign Bank Debt
Business Acquisition [Line Items]
Assumed debt							32,700
Repayments of debt	18,600
Total bank debt	10,900	10,900	10,900	10,900			$ 32,700
Current maturities of long-term debt	$ 4,200	$ 4,200	4,200	$ 4,200
Heimbach | Foreign Bank Debt | Minimum
Business Acquisition [Line Items]
Interest rate, stated percentage							0.98%
Heimbach | Foreign Bank Debt | Maximum
Business Acquisition [Line Items]
Interest rate, stated percentage							5.52%
Heimbach | AEC Technology
Business Acquisition [Line Items]
Acquired finite-lived intangibles							$ 8,900
Finite-lived intangible assets, useful life							9 years
Amortization of intangible assets			$ 300
Heimbach | AEC Tradema
Business Acquisition [Line Items]
Acquired indefinite-lived intangible assets							$ 6,000