Impairments of Goodwill and Other Long-Lived Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Segment Reporting Information [Line Items]
Impairment of goodwill	$ 48,671		$ 48,671
Goodwill		$ 133,912	85,385
Impairment of other long-lived assets	$ 12,438
Performance Materials
Segment Reporting Information [Line Items]
Weighted-average cost of capital (as a percent)	11.50%	9.20%
Impairment of goodwill	$ 48,671	$ 63,000	48,671
Goodwill	31,900	80,658	$ 31,965
Impairment of other long-lived assets	$ 12,438	$ 1,200
Thermal Acoustical Solutions
Segment Reporting Information [Line Items]
Weighted-average cost of capital (as a percent)	10.80%	9.20%
Impairment of goodwill	$ 0
Impairment of other long-lived assets	$ 0