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Basis Of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Basis Of Presentation (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Goodwill, Impairment Loss	$ 15,413	$ 0	$ 15,413	$ 0
Goodwill	55,195		55,195		$ 70,608
Surface Protection Films [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Goodwill, Impairment Loss	15,400
Goodwill, Impairment Loss, Net of Tax	11,900
Goodwill	$ 41,900		$ 41,900		$ 57,300

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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