Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	$ 86,245	$ 86,021
Accumulated amortization	(51,387)	(47,445)
Net carrying amount	34,858	38,576
Goodwill [Line Items]
Goodwill	180,912	180,181
Total Indefinite-lived intangible assets:	187,050	186,251
MC Goodwill
Goodwill [Line Items]
Goodwill	67,407	66,873
AEC Goodwill
Goodwill [Line Items]
Goodwill	113,505	113,308
Heimbach Trade name
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	6,138	6,070
AEC Trademarks and trade names
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	208	208
Accumulated amortization	(194)	(186)
Net carrying amount	$ 14	$ 22
AEC Trademarks and trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	6 years	6 years
AEC Trademarks and trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	15 years	15 years
AEC Technology
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	$ 6,226	$ 6,161
Accumulated amortization	(3,201)	(2,735)
Net carrying amount	$ 3,025	$ 3,426
AEC Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	10 years	10 years
AEC Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	15 years	15 years
AEC Intellectual property
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	15 years	15 years
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	$ 1,250	$ 1,250
Accumulated amortization	(402)	(339)
Net carrying amount	848	911
AEC Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	69,395	69,360
Accumulated amortization	(46,500)	(43,875)
Net carrying amount	$ 22,895	$ 25,485
AEC Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	8 years	8 years
AEC Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	15 years	15 years
Heimbach Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortization  life in years	9 years	9 years
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	$ 9,166	$ 9,042
Accumulated amortization	(1,090)	(310)
Net carrying amount	$ 8,076	$ 8,732