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Derivative Financial Instruments - Summary of Classification of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Prepaid expenses and other |  |
Fair value of the derivative instruments |  |
Other derivative instruments, net | $ 914 |
Accrued liabilities and other |  |
Fair value of the derivative instruments |  |
Fair value of derivative liability | 644 |
Silver and Gold Concentrate Sales Agreements | Prepaid expenses and other |  |
Fair value of the derivative instruments |  |
Other derivative instruments, net | 784 | $ 251
Silver and Gold Concentrate Sales Agreements | Accrued liabilities and other |  |
Fair value of the derivative instruments |  |
Fair value of derivative liability | 644 | $ 222
Zinc Put and Call Options [Member] | Prepaid expenses and other |  |
Fair value of the derivative instruments |  |
Other derivative instruments, net | 113 |
Interest rate swap | Prepaid expenses and other |  |
Fair value of the derivative instruments |  |
Other derivative instruments, net | $ 17 |

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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