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CEO Transition Expenses

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Strategic Initiative Expenses

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Segment Information - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Impairment of goodwill and other long-lived assets	$ 64,206								$ 64,206	$ 0	$ 0
Amortization of intangible assets									21,500	9,300	4,500
Severance expenses									1,900
Non-cash long-lived asset impairment									64,206	0	772
Net sales	193,288	$ 205,274	$ 220,811	$ 218,025	$ 209,938	$ 197,886	$ 186,413	$ 191,660	837,398	785,897	698,437
Sales Revenue \| Customer Concentration Risk \| Ford Motor Company
Segment Reporting Information [Line Items]
Net sales									$ 99,100	$ 116,100	$ 120,700
Concentration risk (as a percent)									11.80%	14.80%	17.30%
Corporate
Segment Reporting Information [Line Items]
CEO Transition Expenses									$ 2,300
Strategic initiative expenses									1,500		$ 800
Transaction related costs										$ 3,600
Thermal/Acoustical Metals Segment and Thermal/Acoustical Fibers Segment
Segment Reporting Information [Line Items]
Integration related costs											1,700
Technical Nonwovens Segment
Segment Reporting Information [Line Items]
Impairment of goodwill and other long-lived assets	0
Restructuring expenses									800	2,300	700
Purchase accounting adjustments related to inventory step-up											1,100
Thermal/Acoustical Metals Segment and Technical Nonwovens Segment
Segment Reporting Information [Line Items]
Severance expenses											300
Integration related costs											700
Performance Materials
Segment Reporting Information [Line Items]
Impairment of goodwill and other long-lived assets	64,206								64,200
Amortization of intangible assets									$ 12,200
Purchase accounting adjustments related to inventory step-up										$ 2,000
Non-cash long-lived asset impairment											$ 800
Thermal Acoustical Solutions Segment
Segment Reporting Information [Line Items]
Impairment of goodwill and other long-lived assets	$ 0