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Segment Reporting (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Revenue | $ 168,847 | $ 200,825 | $ 204,525 | $ 171,797 | $ 205,929 | $ 230,593 | $ 254,406 | $ 204,564 | $ 745,994 | $ 895,492 | $ 1,021,200
Silver [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  | 394,500 | 549,700 | 662,600
Gold [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  |  | $ 351,500 | $ 345,800 | $ 358,600
Metals [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of Trading Counterparties |  |  |  |  |  |  |  |  | 5 |  |
Metals [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 72.00% | 91.00% | 82.00%
Gold and Silver [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of Trading Counterparties |  |  |  |  |  |  |  |  | 8 |  |
Gold and Silver [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 28.00% | 9.00% | 18.00%

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- Definition Number of Trading Counterparties + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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