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Debt - Additional information (Details) € in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) payment | Dec. 01, 2020 USD ($) | Aug. 31, 2020 USD ($) | Feb. 28, 2021 USD ($) | Dec. 31, 2020 USD ($) payment | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) payment | Dec. 31, 2019 USD ($) | Dec. 31, 2020 EUR (€) payment | Dec. 31, 2020 CAD ($) payment | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 CAD ($) | Jun. 05, 2019 USD ($) | May 31, 2019 USD ($) payment
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of borrowings |  |  |  |  |  |  | $ 132,714,000 | $ 600,000,000 |  |  |  |  |  |
Amortization of discount and transaction costs of senior secured notes due to early redemption |  |  |  |  |  |  | 2,286,000 | 0 |  |  |  |  |  |
Senior secured notes redemption premium |  |  |  |  |  |  | 6,275,000 | 0 |  |  |  |  |  |
Borrowings | $ 501,132,000 |  |  |  | $ 501,132,000 |  | 501,132,000 | 479,732,000 |  |  |  |  |  |
Tüprag Metal Madencilik Sanayi ve Ticaret AS ("Tüprag") |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of guarantee fees |  |  |  |  |  |  | 1,344,000 |  |  |  |  |  |  |
Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Borrowings, issuance percentage |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% |
Debt fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |
Repayment of borrowings |  | $ 8,183,000 | $ 65,530,000 |  |  |  | 66,047,000 |  |  |  |  |  |  |
Redemptions of borrowings |  | 7,473,000 | 58,574,000 |  |  |  |  |  |  |  |  |  |  |
Repayments of redemption premium |  | $ 710,000 | 5,565,000 |  |  |  |  |  |  |  |  |  |  |
Repayments of interest |  |  | $ 1,391,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings | 226,647,000 |  |  |  | 226,647,000 |  | 226,647,000 | 287,568,000 |  |  |  |  |  |
Senior Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000
Term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 133,333,000 |  |  |  | 133,333,000 | $ 200,000,000 | 133,333,000 |  |  |  |  |  |  | $ 200,000,000
Repayment of borrowings |  |  |  |  | $ 33,333,000 | $ 33,333,000 | $ 66,667,000 |  |  |  |  |  |  |
Number of payments on borrowings | payment | 2 |  |  |  | 2 |  | 2 |  | 2 | 2 |  |  |  | 6
Borrowings | $ 131,842,000 |  |  |  | $ 131,842,000 |  | $ 131,842,000 | 197,761,000 |  |  |  |  |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 2.25% |  |  |  | 2.25% |  | 2.25% |  | 2.25% | 2.25% |  |  |  |
Term loan | Repayment of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of borrowings |  |  |  | $ 11,100,000 |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 150,000,000 |  |  |  | $ 150,000,000 |  | $ 150,000,000 |  |  |  |  |  |  | $ 250,000,000
Borrowings | $ 150,000,000 |  |  |  | 150,000,000 |  | 150,000,000 | 0 |  |  |  |  |  |
Loan undrawn standby fee (as a percent) | 0.5625% |  |  |  |  |  |  |  |  |  |  |  |  |
Current prepaid expenses | $ 2,191,000 |  |  |  | 2,191,000 |  | 2,191,000 | 2,865,000 |  |  |  |  |  |
Non-Financial Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 70,800,000 |  |  |  | $ 70,800,000 |  | $ 70,800,000 | 64,500,000 | € 57,600 | $ 400 | € 57,600 | $ 400 |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 1.50% |  |  |  | 1.50% |  | 1.50% |  | 1.50% | 1.50% |  |  |  |
Borrowings, interest rate basis spread addition on LIBOR rate (as a percent) | 0.37% |  |  |  | 0.37% |  | 0.37% |  | 0.37% | 0.37% |  |  |  |
Financial Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 2.25% |  |  |  | 2.25% |  | 2.25% |  | 2.25% | 2.25% |  |  |  |
Borrowings, interest rate basis spread addition on LIBOR rate (as a percent) | 0.37% |  |  |  | 0.37% |  | 0.37% |  | 0.37% | 0.37% |  |  |  |
Bottom of range | Term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 2.25% |  |  |  | 2.25% |  | 2.25% |  | 2.25% | 2.25% |  |  |  |
Bottom of range | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 2.25% |  |  |  | 2.25% |  | 2.25% |  | 2.25% | 2.25% |  |  |  |
Top of range | Term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 3.25% |  |  |  | 3.25% |  | 3.25% |  | 3.25% | 3.25% |  |  |  |
Top of range | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread on LIBOR rate (as a percent) | 3.25% |  |  |  | 3.25% |  | 3.25% |  | 3.25% | 3.25% |  |  |  |
Prior to December 1, 2021 | Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount of borrowings (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Premium percentage of principal amount of borrowings (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |
Borrowings, additional basis points |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |
Percentage of original principal amount of borrowings (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |
Redemption percentage of aggregate principal amount of borrowings (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 109.50% |
December 1, 2021 | Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption percentage of aggregate principal amount of borrowings (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 107.125% |
After December 1, 2022 | Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption percentage of aggregate principal amount of borrowings (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Fair value | Senior Secured Notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 260,500,000 |  |  |  | $ 260,500,000 |  | $ 260,500,000 | 324,000,000 |  |  |  |  |  |
Gains on change in fair value of derivatives |  |  |  |  |  |  | 1,760,000 | $ 4,224,000 |  |  |  |  |  |
Fair value | Term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 133,333,000 |  |  |  | $ 133,333,000 |  | $ 133,333,000 |  |  |  |  |  |  |

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