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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Assets | $ 20,383 | $ 18,720
Liabilities: |  |
Total liabilities | 52,295 | 49,920
Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 926 | 914
Liabilities: |  |
Fair value of derivative liability | 2,660 | 644
Silvertip Mine |  |
Liabilities: |  |
Fair value of derivative liability | 49,635 | 49,276
Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities |  | 17,806
Level 1 |  |
Assets: |  |
Assets | 19,457 | 15,589
Liabilities: |  |
Total liabilities | 0 | 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 | 0
Level 1 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | 19,457 | 15,589
Level 2 |  |
Assets: |  |
Assets | 926 | 914
Liabilities: |  |
Total liabilities | 2,660 | 644
Level 2 | Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 926 | 914
Liabilities: |  |
Fair value of derivative liability | 2,660 | 644
Level 2 | Silvertip Mine |  |
Liabilities: |  |
Fair value of derivative liability | 0 | 0
Level 2 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | 0 | 0
Level 3 |  |
Assets: |  |
Assets | 0 | 2,217
Liabilities: |  |
Total liabilities | 49,635 | 49,276
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 |  | 2,217
Silvertip Mine | Level 3 |  |
Liabilities: |  |
Fair value of derivative liability | 49,635 | $ 49,276
Available-for-sale Securities | Level 3 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | $ 0 |

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