Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	$ 85,570	$ 86,021
Accumulated amortization	(48,666)	(47,445)
Net carrying amount	36,904	38,576
Goodwill [Line Items]
Goodwill	178,704	180,181
Total Indefinite-lived intangible assets:	184,639	186,251
MC Goodwill
Goodwill [Line Items]
Goodwill	65,785	66,873
AEC Goodwill
Goodwill [Line Items]
Goodwill	112,919	113,308
Heimbach Trade name
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	5,935	6,070
AEC Trademarks and trade names
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	208	208
Accumulated amortization	(189)	(186)
Net carrying amount	$ 19	$ 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	$ 6,033	$ 6,161
Accumulated amortization	(2,824)	(2,735)
Net carrying amount	$ 3,209	$ 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	(360)	(339)
Net carrying amount	890	911
AEC Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Gross carrying amount	69,290	69,360
Accumulated amortization	(44,721)	(43,875)
Net carrying amount	$ 24,569	$ 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	$ 8,789	$ 9,042
Accumulated amortization	(572)	(310)
Net carrying amount	$ 8,217	$ 8,732