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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / oz | Dec. 31, 2014 USD ($) $ / oz | Dec. 31, 2013 USD ($) $ / oz
Property, Plant and Equipment [Line Items] |  |  |
Drilling and Related Costs Capitalized | $ | $ 6,000 | $ 8,900 |
Write-downs | $ | $ 313,337 | $ 1,472,721 | $ 772,993
Long-Lived Assets, Impairment Testing, Commodity, Silver, Price per Ounce | $ / oz | 17.50 | 19.00 | 25.00
Long-Lived Assets, Impairment Testing, Commodity, Gold, Price per Ounce | $ / oz | 1,200 | 1,275 | 1,450
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Fair Value Inputs, Discount Rate | 11.00% |  |
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Fair Value Inputs, Discount Rate | 7.50% |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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=36462937&loc=d3e19207-110258 + Details
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