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Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivatives, Fair Value [Line Items] |  |  |
Net asset (liability) | $ (2,720) | $ (558) |
Cost of Goods and Services Sold | 849,756 | 767,550 | $ 659,867
Flexible Packaging Films [Member] [Domain] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 0 | 0 | 0
Flexible Packaging Films [Member] [Domain] | Accrued Expenses |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives | (1,053) |  |
Net asset (liability) |  | (558) |
Flexible Packaging Films [Member] [Domain] | Designated as Hedging Instrument | Accrued Expenses |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives | 37 | 0 |
Aluminum futures contracts | 1,090 | 558 |
Flexible Packaging Films [Member] [Domain] | Not Designated as Hedging Instrument [Member] | Accrued Expenses |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives | 0 | 0 |
Aluminum futures contracts | 0 | 0 |
Aluminum Futures Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (1,123) | 1,501 | 394
Aluminum Futures Contracts | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net asset (liability) | (1,630) |  |
Aluminum Futures Contracts | Accrued Expenses |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net asset (liability) |  | 562 |
Aluminum Futures Contracts | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives | 20 |  |
Aluminum futures contracts | (1,650) |  |
Aluminum Futures Contracts | Designated as Hedging Instrument | Accrued Expenses |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives |  | 578 |
Aluminum futures contracts |  | (16) |
Aluminum Futures Contracts | Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aluminum futures contracts | 0 |  |
Aluminum Futures Contracts | Not Designated as Hedging Instrument [Member] | Accrued Expenses |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset derivatives |  | 0 |
Aluminum futures contracts |  | 0 |
Selling, General and Administrative Expenses [Member] | Flexible Packaging Films [Member] [Domain] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (2,105) |  |
Cost of Sales [Member] | Flexible Packaging Films [Member] [Domain] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 62 | 62 | 62
Cost of Sales [Member] | Aluminum Futures Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1,069 | 1,210 | (1,630)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Forward Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Cost of Goods and Services Sold | (62) | (62) | 62
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Aluminum Futures Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Cost of Goods and Services Sold | (1,069) | (1,210) | $ (1,630)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Selling, General and Administrative Expenses [Member] | Foreign Currency Forward Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Cost of Goods and Services Sold | $ (1,796) | $ (43) |

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