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Financial Instruments and Derivatives - Additional Information (Details) MMBTU in Millions |  |  | 1 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 21, 2021 USD ($) | May 13, 2021 USD ($) | Mar. 31, 2020 USD ($) | Jul. 04, 2021 USD ($) MMBTU T | Jun. 28, 2020 USD ($) | May 25, 2021 USD ($) | May 25, 2021 EUR (€) | Apr. 28, 2021 USD ($) | Apr. 07, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Jan. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of commodity cash flow hedges, gain (loss) |  |  |  | $ 5,381,000 |  |  |  |  |  | $ (647,000) |
Commodity gain (loss) expected to be reclassified to the income statement during the next 12 months |  |  |  | 3,478,000 |  |  |  |  |  |  |
Fair value of foreign currency cash flow hedges, gain (loss) |  |  |  | 763,000 |  |  |  |  |  | 555,000 |
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months |  |  |  | 763,000 |  |  |  |  |  |  |
Proceeds from foreign exchange forward contracts and interest rate swaps |  |  |  | 4,387,000 | $ 14,480,000 |  |  |  |  |  |
Total fair value of other derivatives not designated as hedging instruments |  |  |  | 172,000 |  |  |  |  |  | 599,000 |
1.0% Euro loan due May 2021 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  | $ 0 |  | $ 177,780,000 |  |  |  | 183,662,000 |
Interest rate (percent) |  |  |  | 1.00% |  | 1.00% | 1.00% |  |  |  |
Debt principal | € |  |  |  |  |  |  | € 150,000,000 |  |  |  |
5.75% debentures due November 2040 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount offered to be repurchased |  |  |  |  |  |  |  | $ 300,000,000 |  |  |
Outstanding balance |  |  |  | $ 536,165,000 |  |  |  | $ 600,000,000 |  | 599,279,000 |
Interest rate (percent) |  |  |  | 5.75% |  |  |  | 5.75% |  |  |
Natural Gas Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approximate amount of commodity covered by swap contracts outstanding (in MMBTUs) | MMBTU |  |  |  | 5.5 |  |  |  |  |  |  |
Anticipated usage percentage covered by a swap contract for the current fiscal year (percent) |  |  |  | 62.00% |  |  |  |  |  |  |
Anticipated usage percentage covered by a swap contract for the next fiscal year (percent) |  |  |  | 41.00% |  |  |  |  |  |  |
Aluminum Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Anticipated usage percentage covered by a swap contract for the current fiscal year (percent) |  |  |  | 53.00% |  |  |  |  |  |  |
Approximate amount of commodity covered by swap contracts outstanding (in tons) | T |  |  |  | 1,810 |  |  |  |  |  |  |
Forward contracts |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of foreign currency cash flow hedges, gain (loss) |  |  |  | $ (274,000) |  |  |  |  |  | $ 47,000 |
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months |  |  |  | (271,000) |  |  |  |  |  |  |
Foreign currency gain (loss) reclassified to the income statement |  |  |  | $ 62,000 |  |  |  |  |  |  |
Cross-currency swap |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | € 150,000,000 |  | $ 250,000,000
Gain (loss) on derivative | $ 4,387,000 |  |  |  |  |  |  |  |  |  |
Proceeds from foreign exchange forward contracts and interest rate swaps |  |  | $ 14,480,000 |  |  |  |  |  |  |  |
Tax provision on foreign currency translation gain |  |  | $ 7,581,000 |  |  |  |  |  |  |  |
Reverse Treasury Lock Contract |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
Gain (loss) on derivative |  | $ (1,356,000) |  |  |  |  |  |  |  |  |

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