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Summary Of Significant Accounting Policies (Narrative) (Details). - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 400 | $ 500 | $ 600 |
Cash | 19,200 | 30,500 |  |
Cash and cash equivalents | 19,232 | 30,521 |  |
Goodwill | 70,608 | 70,608 | 67,708 |
Goodwill impairment | 0 | $ 0 | $ 13,696 |
Defined benefit plan estimated required future employer contributions in next fiscal year | $ 50,000 |  |  |
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock | 2,760,983 | 1,582,222 | 1,212,375 |
Pension Benefits |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | $ 103,998 | $ 109,893 | $ 150,267 |
Surface protection films |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  | 18.60%
Goodwill | 57,300 |  |  |
Long-Lived Assets | $ 29,300 |  |  |
Aacoa [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill impairment |  | 13,700 |  |
Goodwill, Impairment Loss, Net of Tax |  | 10,500 |  |
Minimum | Buildings And Land Improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Average useful life | 5 years |  |  |
Minimum | Machinery and Equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Average useful life | 2 years |  |  |
Maximum | Buildings And Land Improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Average useful life | 40 years |  |  |
Maximum | Machinery and Equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Average useful life | 20 years |  |  |
Foreign Country |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 10,300 | $ 16,400 |  |

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