Acquisition - Narrative (Details) t in Thousands, $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	May 13, 2021 USD ($) employee t	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 191,619	$ 191,619	$ 164,369
Intangible assets, net		90,709	90,709	81,835
Georgia-Pacific Mt. Holly LLC, Georgia-Pacific's U.S. Nonwovens Business ("Mount Holly")
Business Acquisition [Line Items]
Business acquisition purchase price	$ 170,900
Annual production capacity | t	37
Number of employees employed | employee	140
Annual sales of acquiree				$ 100,000
Acquired intangible assets estimated remaining life	11 years
Goodwill	$ 36,231
Intangible assets, net	$ 20,000
Goodwill deductible for tax purposes, period	15 years
Pro forma revenue of acquiree			34,200
Pro forma operating income of acquiree			4,000
One-time costs		$ 200	$ 4,600
Georgia-Pacific Mt. Holly LLC, Georgia-Pacific's U.S. Nonwovens Business ("Mount Holly") | Minimum
Business Acquisition [Line Items]
Acquired property, plant and equipment estimated remaining lives	5 years
Georgia-Pacific Mt. Holly LLC, Georgia-Pacific's U.S. Nonwovens Business ("Mount Holly") | Maximum
Business Acquisition [Line Items]
Acquired property, plant and equipment estimated remaining lives	35 years