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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2015 | Sep. 30, 2017 | Jul. 31, 2017 | May 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Gain on repurchase of the Rochester royalty obligation |  | $ 0 | $ 2,332 | $ 0 |  |  |  |
Ownership in Metalla Royalty & Streaming Ltd. |  |  |  |  | 19.90% |  |  |
Senior Notes due 2024 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Net unamortized debt issuance costs |  |  | $ 4,900 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.875% |
Senior Notes due 2024 | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.875% |  |  |  |  |
Senior Notes due 2021 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Net unamortized debt issuance costs |  |  |  |  |  |  |  | $ 2,000
Senior Notes due 2021 | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 7.875% |  |  |  |  |
Rochester Royalty Obligation |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, amount |  |  |  |  |  |  | $ 5,000 |
Non-core three royalties and stream |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | $ 13,000 |  |
Convertible debenture |  |  |  |  |  | $ 6,700 |  |
Debt Securities | Metalla Royalty & Streaming Ltd. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  |  |  |
Silvertip Mine |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Contingent consideration payment | $ 25,000 |  |  |  |  |  |  |
Permitting payment, estimated discount rate (percentage) | 2.50% |  |  |  |  |  |  |
Resource declaration payment, estimated discount rate (percentage) | 2.90% |  |  |  |  |  |  |

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