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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Fair value of equity and debt securities | $ 15,086 |
Assets | 15,752 | $ 36,399
Liabilities: |  |
Total liabilities |  | 25,275
Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 666 | 753
Liabilities: |  |
Fair value of derivative liability | 0 | 275
Silvertip Mine |  |
Liabilities: |  |
Fair value of derivative liability |  | 25,000
Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities |  | 35,646
Level 1 |  |
Assets: |  |
Assets | 15,086 | 35,646
Liabilities: |  |
Total liabilities |  | 0
Level 1 | Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 | 0
Liabilities: |  |
Fair value of derivative liability | 0 | 0
Level 1 | Silvertip Mine |  |
Liabilities: |  |
Fair value of derivative liability |  | 0
Level 1 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | 15,086 | 35,646
Level 2 |  |
Assets: |  |
Assets | 666 | 753
Liabilities: |  |
Total liabilities |  | 275
Level 2 | Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 666 | 753
Liabilities: |  |
Fair value of derivative liability |  | 275
Level 2 | Silvertip Mine |  |
Liabilities: |  |
Fair value of derivative liability |  | 0
Level 2 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | 0 | 0
Level 3 |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Total liabilities |  | 25,000
Level 3 | Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 | 0
Liabilities: |  |
Fair value of derivative liability | 0 | 0
Level 3 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities |  | 0
Silvertip Mine | Level 3 |  |
Liabilities: |  |
Fair value of derivative liability |  | $ 25,000
Available-for-sale Securities | Level 3 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | $ 0 |

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