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Commitments and Contractual Obligations - Summary of Contractual Obligations (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Disclosure of contingent liabilities [line items]  
Contractual capital commitments $ 783,309
2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 146,203
2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 84,670
2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 160,998
2024  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 241,546
2025 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 149,892
Debt  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 517,287
Debt | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 66,667
Debt | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 66,667
Debt | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 150,000
Debt | 2024  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 233,953
Debt | 2025 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 0
Purchase obligations  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 60,587
Purchase obligations | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 56,903
Purchase obligations | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 2,967
Purchase obligations | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 239
Purchase obligations | 2024  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 239
Purchase obligations | 2025 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 239
Leases  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 36,086
Leases | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 13,274
Leases | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 6,277
Leases | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 2,822
Leases | 2024  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 2,298
Leases | 2025 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 11,415
Mineral properties  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 30,662
Mineral properties | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,658
Mineral properties | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,467
Mineral properties | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,636
Mineral properties | 2024  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,636
Mineral properties | 2025 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 12,265
Asset retirement obligations  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 138,687
Asset retirement obligations | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,701
Asset retirement obligations | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,292
Asset retirement obligations | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 3,301
Asset retirement obligations | 2024  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 420
Asset retirement obligations | 2025 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments $ 125,973