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v3.19.1

Subsequent Events (Details) |  | 12 Months Ended
--- | --- | ---
Feb. 22, 2019 USD ($) shares $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Transaction costs |  | $ 10,229,000 | $ 0
Repayment of credit facility |  | $ 0 | $ 36,200,000
Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [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 | $ 275,000,000 |  |
Number of shares issued (shares) | shares | 55,990,512 |  |
Other tangible or intangible assets transferred | $ 313,887,490 |  |
Consideration transferred | $ 1,100,000,000 |  |
Pan American shareholders [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Percent owned after share issuance | 73.00% |  |
Former Tahoe shareholders [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Percent owned after share issuance | 27.00% |  |
Credit Facility [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Credit facility term |  | 4 years |
Line of credit, maximum borrowing capacity |  | $ 300,000,000.0 |
Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Line of credit, maximum borrowing capacity | $ 500,000,000.0 |  |
Amount by which facility has been increased | 200,000,000.0 |  |
Long-term debt | 301,000,000 |  |
Repayment of credit facility | $ 125,000,000 |  |
Bottom of range [member] | Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Line of credit facility, unused capacity, commitment fee (percent) | 0.4219% |  |
Top of range [member] | Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Line of credit facility, unused capacity, commitment fee (percent) | 0.6188% |  |
LIBOR [member] | Bottom of range [member] | Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings, adjustment to interest rate basis | 1.875% |  |
LIBOR [member] | Top of range [member] | Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings, adjustment to interest rate basis | 2.75% |  |
Bank of Nova Scotia's Base Rate [member] | Bottom of range [member] | Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings, adjustment to interest rate basis | 0.875% |  |
Bank of Nova Scotia's Base Rate [member] | Top of range [member] | Credit Facility [member] | Major business combination [member] | Tahoe Resources, Inc [member] |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings, adjustment to interest rate basis | 1.75% |  |

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