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Financial instruments and derivatives - Additional Information (Details) BTU in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 11, 2022 USD ($) | May 21, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) BTU | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 21, 2022 USD ($) bank | Apr. 07, 2021 EUR (€) | Jan. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Net cash settlement on termination of swap |  |  |  | $ 4,387,000 | $ 14,480,000 | $ 0 |  |  |
Anticipated usage percentage covered by a swap contract for the current fiscal year (percent) |  |  |  | 92,000 | 599,000 |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of banks | bank |  |  |  |  |  |  | 2 |  |
Gain (loss) on settlement | $ 5,201,000 |  |  |  |  |  |  |  |
Unsecured Debt | Subsequent event |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 150,000,000,000 |  |
Unsecured Debt | Subsequent event | 2032 Notes |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate (percent) |  |  |  |  |  |  | 2.85% |  |
Cash Flow Hedges | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair value of commodity cash flow hedges |  |  |  | 1,491,000 | (647,000) |  |  |  |
Commodity gain (loss) expected to be reclassified to the income statement during the next 12 months |  |  |  | 1,491,000 |  |  |  |  |
Fair value of foreign currency cash flow hedges |  |  |  | 336,000 | 555,000 |  |  |  |
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months |  |  |  | $ 336,000 |  |  |  |  |
Natural gas swaps |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Approximate amount of commodity covered by swap contracts outstanding (btu) | BTU |  |  |  | 5.6 |  |  |  |  |
Anticipated usage percentage covered by a swap contract for the next fiscal year (percent) |  |  |  | 73.00% |  |  |  |  |
Natural gas swaps | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Approximate amount of commodity covered by swap contracts outstanding (btu) | BTU |  |  |  | 3.9 |  |  |  |  |
Natural gas swaps | Cash Flow Hedges | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Approximate amount of commodity covered by swap contracts outstanding (btu) | BTU |  |  |  | 1.7 |  |  |  |  |
Forward Contracts | Cash Flow Hedges | Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair value of foreign currency cash flow hedges |  |  |  | $ (457,000) | $ 47,000 |  |  |  |
Foreign currency gain (loss) expected to be reclassified to the income statement during the next 12 months |  |  |  | (457,000) |  |  |  |  |
Foreign currency gain (loss) reclassified to the income statement |  |  |  | (330,000) |  |  |  |  |
Cross currency swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | € 150,000,000 | $ 250,000,000
Net cash settlement on termination of swap |  |  | $ 14,480,000 |  |  |  |  |  |
Tax provision on foreign currency translation gain |  |  | $ 7,581,000 |  |  |  |  |  |
Gain or (Loss) Recognized |  | $ 4,387,000 |  |  |  |  |  |  |
Interest Rate Lock Contract | Selling, general and administrative |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Gain or (Loss) Recognized |  |  |  | $ (550,000) |  |  |  |  |

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