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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Assets | $ 37,869 | $ 35,088
Liabilities: |  |
Total liabilities | 48,414 | 48,187
Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 552 | 251
Liabilities: |  |
Fair value of derivative liability | 125 | 222
Silvertip Mine |  |
Liabilities: |  |
Fair value of derivative liability | 48,289 | 47,965
Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | 37,317 | 34,837
Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | 31,003 | 28,245
Level 1 |  |
Assets: |  |
Assets | 31,003 | 27,946
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 | 31,003 | 27,946
Level 2 |  |
Assets: |  |
Assets | 552 | 251
Liabilities: |  |
Total liabilities | 125 | 222
Level 2 | Other derivative instruments, net |  |
Assets: |  |
Fair value of other derivative instruments, net | 552 | 251
Liabilities: |  |
Fair value of derivative liability | 125 | 222
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 | 6,314 | 6,891
Liabilities: |  |
Total liabilities | 48,289 | 47,965
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 |  | 6,891
Silvertip Mine |  |
Liabilities: |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 48,289 | $ 47,965
Available-for-sale Securities | Level 3 | Equity and debt securities |  |
Assets: |  |
Fair value of equity and debt securities | $ 6,314 |

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