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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Financial assets and liabilities measured at fair value on recurring basis | The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement (in thousands):
| Fair Value at December 31, 2013
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Marketable equity securities | $ | 14,521 |  |  | $ | 14,521 |  |  | $ | — |  |  | $ | — |
Gold and silver put options | 135 |  |  | — |  |  | 135 |  |  | — |
| $ | 14,656 |  |  | $ | 14,521 |  |  | $ | 135 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Palmarejo royalty obligation embedded derivative | $ | 40,338 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,338 |
Rochester NSR royalty obligation | 21,630 |  |  | — |  |  | — |  |  | 21,630 |
Other derivative instruments, net | 1,590 |  |  | — |  |  | 1,590 |  |  | — |
| $ | 63,558 |  |  | $ | — |  |  | $ | 1,590 |  |  | $ | 61,968 |
| Fair Value at December 31, 2012
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Short-term investments | $ | 999 |  |  | $ | 999 |  |  | $ | — |  |  | $ | — |
Marketable equity securities | 27,065 |  |  | 27,065 |  |  | — |  |  | — |
Put and call options | 943 |  |  | — |  |  | 943 |  |  | — |
| $ | 29,007 |  |  | $ | 28,064 |  |  | $ | 943 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Palmarejo royalty obligation embedded derivative | $ | 145,098 |  |  | $ | — |  |  | $ | 145,098 |  |  | $ | — |
Put and call options | 9,299 |  |  | — |  |  | 9,299 |  |  | — |
| $ | 154,397 |  |  | $ | — |  |  | $ | 154,397 |  |  | $ | — |
Changes in the fair value of the Comany's Level 3 financial liabilities |
| Balance at the beginning of the period |  | Additions |  | Revaluation |  | Transfers from Level 2 |  | Balance at the end of the period |  | Unrealized gains (losses) recognized in income statement
Palmarejo royalty obligation embedded derivative | $ | — |  |  | $ | — |  |  | $ | (104,760 | ) |  | $ | 145,098 |  |  | $ | 40,338 |  |  | $ | 104,760 |
Rochester NSR royalty obligation | — |  |  | 22,046 |  |  | (416 | ) |  | — |  |  | 21,630 |  |  | 416 |
Quantitative and qualitative information related to unobservable inputs | The following table sets forth the quantitative and qualitative information related to the unobservable inputs used in the calculation of the Company's non-recurring Level 3 fair value measurements:
Description | Valuation technique | Unobservable input | Range / Weighted Average
Property, plant, and equipment | Discounted cash flow | Discount rate | 8.5% - 10.5%
|  | Long-term silver price | $25.00
|  | Long-term gold price | $1,450
Mining properties | Discounted cash flow | Discount rate | 8.5% - 10.5%
|  | Long-term silver price | $25.00
|  | Long-term gold price | $1,450
Financial Assets and Liabilities not Measured at Fair Value | inancial assets and liabilities that are measured at book value in the financial statements at December 31, 2013 and December 31, 2012 are presented in the following table (in thousands):
| Fair Value at December 31, 2013
| Total |  | Level 1 |  | Level 2 |  | Level 3
Liabilities: |  |  |  |  |  |  |
3.25% Convertible Senior Notes due 2028 | $ | 5,067 |  |  | $ | 5,067 |  |  | $ | — |  |  | $ | — |
7.875% Senior Notes due 2021 | 307,314 |  |  | 307,314 |  |  | — |  |  | — |
Palmarejo Gold Production Royalty Obligation | 65,212 |  |  | — |  |  | — |  |  | 65,212 |
| Fair Value at December 31, 2012
| Total |  | Level 1 |  | Level 2 |  | Level 3
Liabilities: |  |  |  |  |  |  |
3.25% Convertible Senior Notes due 2028 | $ | 48,220 |  |  | $ | 48,220 |  |  | $ | — |  |  | $ | — |
Palmarejo Gold Production Royalty Obligation | 90,617 |  |  | — |  |  | 90,617 |  |  | — |

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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