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Restructuring and Impairment Charges (Schedule Of Restructuring Reserve Activity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |
Accrued | $ 1,847 | $ 1,006
Cash Charges | 6,437 | 6,578
Non-cash charges | 93 | 11,747
Cash payments | (8,041) | (5,737)
Accrued | 163 | 1,847
Impairment And Loss On Right Of Use Assets [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Accrued |  |
Cash Charges |  |
Non-cash charges |  | 17,540
Cash payments |  |
Accrued |  |
Impairment And Loss On Disposal Of Machinery And Equipment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Accrued |  |
Cash Charges |  |
Non-cash charges | 269 | 9,527
Cash payments |  |
Accrued |  |
Lease Termination Gain [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Non-cash charges |  | (15,200)
Employee Severance And Retention [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Accrued | 1,596 | 647
Cash Charges |  | 3,285
Non-cash charges | (80) |
Cash payments | (1,353) | (2,336)
Accrued | 163 | 1,596
Other Charges Related To Facility Closure [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Accrued | 251 | 359
Cash Charges | 6,437 | 3,293
Non-cash charges | (96) | (120)
Cash payments | (6,688) | (3,401)
Accrued |  | $ 251

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