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Tahoe Acquisition - Additional Information (Details) |  | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 22, 2019 USD ($) shares right $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |
Transaction costs |  |  | $ 7,515,000 | $ 10,229,000
Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |
Cash Election, right to receive cash | $ / shares | $ 3.40 |  |  |
Share Election, right to receive portion of Pan American shares per Tahoe share | 0.2403 |  |  |
Maximum cash consideration | $ 275,000,000 |  |  |
Maximum number of Pan American shares to be issued | shares | 56,000,000.0 |  |  |
Amount of shares for which holders made the Cash Election | shares | 23,661,084 |  |  |
Amount of shares for which holders made or were deemed to have made the Share Election | shares | 290,226,406 |  |  |
Share Election, cash transferred per acquired share | $ / shares | $ 0.67 |  |  |
Share Election, portion of Pan American shares per Tahoe share received as consideration | 0.1929 |  |  |
Contingent consideration, ratio of contingent value rights for each Tahoe share | 1 |  |  |
Contingent consideration, portion of Pan American shares exchanged for each CVR | 0.0497 |  |  |
Contingent consideration, term of CVRs | 10 years |  |  |
Cash transferred | $ 275,008,000 |  |  |
Number of shares issued (shares) | shares | 72,426,594 |  |  |
Consideration transferred | $ 1,142,674,000 |  |  |
Pan American shareholders [member] | Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percent owned after share issuance | 73.00% |  |  |
Former Tahoe shareholders [member] | Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percent owned after share issuance | 27.00% |  |  |
Common Shares [Member] | Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Number of shares issued (shares) | shares | 55,990,512 |  |  |
CVRs [Member] | Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Number of shares issued (shares) | shares | 15,600,208 |  |  |
Number of CVRs issued | right | 313,887,490 |  |  |
Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Revenue contributed |  | $ 565,400,000 |  |
Net income contributed |  | $ 124,500,000 |  |
Revenue that would have been contributed had the transaction occurred January 1, 2018 |  |  | 644,300,000 |
Pre-tax net income that would have been contributed had the transaction occurred January 1, 2018 |  |  | $ 125,500,000 |
Bottom of range [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Discount rates used in discounted future cash flows model |  | 4.00% | 4.00% | 4.50%
Bottom of range [member] | Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Discount rates used in discounted future cash flows model | 5.00% |  |  |
Top of range [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Discount rates used in discounted future cash flows model |  | 12.30% | 12.30% | 9.80%
Top of range [member] | Tahoe Resources, Inc [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Discount rates used in discounted future cash flows model | 9.00% |  |  |

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