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Derivative Financial Instruments - Summary of Mark-to-Market Gain (Losses) on Derivative Instruments (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / oz | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net, pretax | $ 3,638,000 | $ (864,000) | $ (11,581,000) |
Fair value adjustments, net | $ 804,000 | 631,000 | (7,687,000) |
Zinc put options purchased |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Weighted Average Strike Price of Put Options | $ / oz | 3,000.00 |  |  |
Provisional metal sales contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Provisional gain (loss) on derivatives and commodity contracts | $ 111,000 | 631,000 |  | $ (239,000)
Palmarejo gold production royalty |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net, pretax | 0 | 0 | (5,866,000) |
Zinc options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net derivative gain (loss) | 753,000 | 0 | 0 |
Silver and Gold Options [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net, pretax | $ 0 | 0 | (1,582,000) |
Zinc call options sold |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Weighted Average Strike Price of Call Options | 4,050 |  |  |
Interest rate swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net derivative gain (loss) | $ (60,000) | $ 0 | $ 0 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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