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Derivative Financial Instruments - Summary of Mark-to-Market Gain (Losses) on Derivative Instruments - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value adjustments, net, pretax | $ (864) | $ (11,581) | $ 5,202
Fair value adjustments, net | 631 | (7,687) | 4,598
Provisional silver and gold sales contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Provisional gain (loss) on derivatives and commodity contracts | 631 | (239) | 214
Palmarejo gold production royalty |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value adjustments, net, pretax | 0 | (5,866) | 3,101
Silver and gold options |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value adjustments, net, pretax | $ 0 | $ (1,582) | $ 1,283

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624186-113959 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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