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Commitments and Contractual Obligations - Summary of Contractual Obligations (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Disclosure of contingent liabilities [line items]  
Contractual capital commitments $ 716,893
2020  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 116,393
2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 88,719
2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 81,526
2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 7,583
2024 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 422,672
Debt  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 500,000
Debt | 2020  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 66,667
Debt | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 66,667
Debt | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 66,666
Debt | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 0
Debt | 2024 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 300,000
Purchase obligations  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 33,009
Purchase obligations | 2020  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 31,883
Purchase obligations | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 431
Purchase obligations | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 421
Purchase obligations | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 137
Purchase obligations | 2024 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 137
Leases  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 29,679
Leases | 2020  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 10,673
Leases | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 10,075
Leases | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,677
Leases | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 1,944
Leases | 2024 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 2,310
Mineral properties  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 40,305
Mineral properties | 2020  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 5,387
Mineral properties | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 5,433
Mineral properties | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 5,443
Mineral properties | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 5,443
Mineral properties | 2024 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 18,599
Asset retirement obligations  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 113,900
Asset retirement obligations | 2020  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 1,783
Asset retirement obligations | 2021  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 6,113
Asset retirement obligations | 2022  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 4,319
Asset retirement obligations | 2023  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments 59
Asset retirement obligations | 2024 and later  
Disclosure of contingent liabilities [line items]  
Contractual capital commitments $ 101,626