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Retirement Savings Plan (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Postemployment Benefits [Abstract]      
Percentage of employee compensation plus matching contribution 100.00%cde_PercentageOfEmployeeCompensationPlusMatchingContribution    
Percentage of maximum limit for employees to contribute their cash compensation 75.00%cde_PercentageOfMaximumLimitForEmployeesToContributeTheirCashCompensationUnderPlan    
Percentage of employee contribution 4.00%cde_PercentageOfEmployeeContribution    
Total plan expenses $ 2.6us-gaap_DefinedContributionPlanCostRecognized $ 4.1us-gaap_DefinedContributionPlanCostRecognized $ 4.1us-gaap_DefinedContributionPlanCostRecognized