Goodwill and Other Intangible Assets (Schedule of Changes in Intangible Assets and Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 38,576
Other Changes	0
Amortization	(1,298)
Currency Translation	(374)
Ending balance	36,904
Goodwill [Roll Forward]
Beginning balance	180,181
Ending balance	178,704
Indefinite-Lived Intangible Assets Including Goodwill [Roll Forward]
Beginning Balance	186,251
Other Changes	0
Currency Translation	(1,612)
Ending Balance	184,639
MC Goodwill
Goodwill [Roll Forward]
Beginning balance	66,873
Other Changes	0
Currency Translation	(1,088)
Ending balance	65,785
AEC Goodwill
Goodwill [Roll Forward]
Beginning balance	113,308
Other Changes	0
Currency Translation	(389)
Ending balance	112,919
Heimbach Trade name
Indefinite-Lived Intangible Assets [Roll Forward]
Beginning Balance	6,070
Other Changes	0
Currency Translation	(135)
Ending Balance	5,935
AEC Trademarks and trade names
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	22
Other Changes	0
Amortization	(3)
Currency Translation	0
Ending balance	19
AEC Technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	3,426
Other Changes	0
Amortization	(142)
Currency Translation	(75)
Ending balance	3,209
AEC Intellectual property
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	911
Other Changes	0
Amortization	(21)
Currency Translation	0
Ending balance	890
AEC Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	25,485
Other Changes	0
Amortization	(870)
Currency Translation	(46)
Ending balance	24,569
Heimbach Developed technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	8,732
Other Changes	0
Amortization	(262)
Currency Translation	(253)
Ending balance	$ 8,217