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Summary of Significant Accounting Policies Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |
Long-Lived Assets, Impairment Testing, Commodity, Silver, Price per Ounce | 19.00 cde_LongLivedAssetsImpairmentTestingCommoditySilverPriceperOunce | 25.00 cde_LongLivedAssetsImpairmentTestingCommoditySilverPriceperOunce |
Long-Lived Assets, Impairment Testing, Commodity, Gold, Price per Ounce | 1,275 cde_LongLivedAssetsImpairmentTestingCommodityGoldPriceperOunce | 1,450 cde_LongLivedAssetsImpairmentTestingCommodityGoldPriceperOunce |
Certificates of deposit and cash | $ 7,000,000 us-gaap_CertificatesOfDepositAtCarryingValue | $ 7,000,000 us-gaap_CertificatesOfDepositAtCarryingValue |
Write-downs | 1,472,721,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 772,993,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 5,825,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Drilling and Related Costs Capitalized | $ 8,900,000 cde_DrillingandRelatedCostsCapitalized | $ 11,600,000 cde_DrillingandRelatedCostsCapitalized |

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- Definition Long-Lived Assets, Impairment Testing, Commodity, Gold, Price per Ounce + References No definition available. + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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