Goodwill and Other Intangible Assets (Schedule of Changes in Intangible Assets and Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 38,576
Other Changes	0
Amortization	(3,877)
Currency Translation	159
Ending balance	34,858
Goodwill [Roll Forward]
Beginning balance	180,181
Ending balance	180,912
Indefinite-Lived Intangible Assets Including Goodwill [Roll Forward]
Beginning Balance	186,251
Other Changes	0
Currency Translation	799
Ending Balance	187,050
MC Goodwill
Goodwill [Roll Forward]
Beginning balance	66,873
Other Changes	0
Currency Translation	534
Ending balance	67,407
AEC Goodwill
Goodwill [Roll Forward]
Beginning balance	113,308
Other Changes	0
Currency Translation	197
Ending balance	113,505
Heimbach Trade name
Indefinite-Lived Intangible Assets [Roll Forward]
Beginning Balance	6,070
Other Changes	0
Currency Translation	68
Ending Balance	6,138
AEC Trademarks and trade names
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	22
Other Changes	0
Amortization	(8)
Currency Translation	0
Ending balance	14
AEC Technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	3,426
Other Changes	0
Amortization	(428)
Currency Translation	27
Ending balance	3,025
AEC Intellectual property
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	911
Other Changes	0
Amortization	(63)
Currency Translation	0
Ending balance	848
AEC Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	25,485
Other Changes	0
Amortization	(2,611)
Currency Translation	21
Ending balance	22,895
Heimbach Developed technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	8,732
Other Changes	0
Amortization	(767)
Currency Translation	111
Ending balance	$ 8,076