Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (33,287)us-gaap_NetIncomeLoss	$ (37,191)us-gaap_NetIncomeLoss
Adjustments:
Amortization	33,090cde_DepreciationAndDepletion	40,459cde_DepreciationAndDepletion
Accretion	3,150us-gaap_AccretionExpense	4,560us-gaap_AccretionExpense
Deferred income taxes	(2,184)us-gaap_DeferredIncomeTaxExpenseBenefit	(11,781)us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on termination of revolving credit facility	0	3,035
Fair value adjustments, net	4,884cde_FairValueAdjustmentsNet	11,436cde_FairValueAdjustmentsNet
Stock-based compensation	2,150us-gaap_ShareBasedCompensation	2,565us-gaap_ShareBasedCompensation
Impairment of equity securities	1,514us-gaap_ImpairmentOfInvestments	2,588us-gaap_ImpairmentOfInvestments
Other	1,079us-gaap_OtherNoncashIncomeExpense	(817)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Receivables	2,556	5,622
Prepaid expenses and other current assets	(1,327)	(8,109)
Inventories	684us-gaap_IncreaseDecreaseInInventories	(13,912)us-gaap_IncreaseDecreaseInInventories
Accounts payable and accrued liabilities	(16,281)	(8,082)
CASH USED IN OPERATING ACTIVITIES	(3,972)	(9,627)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(17,620)	(11,936)
Acquisitions, net of cash acquired	(102,018)us-gaap_PaymentsToAcquireMineralRights	0us-gaap_PaymentsToAcquireMineralRights
Other	(1,730)	(25)
Purchase of short term investments and equity securities	(278)us-gaap_PaymentsToAcquireInvestments	(46,220)us-gaap_PaymentsToAcquireInvestments
Sales and maturities of short-term investments	229	90
CASH USED IN INVESTING ACTIVITIES	(121,417)	(58,091)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of notes and bank borrowings	53,500	153,000
Payments on long-term debt, capital leases, and associated costs	(8,594)	(4,111)
Gold production royalty payments	(10,368)cde_Cashpaymentsongoldproductionroyalty	(14,683)cde_Cashpaymentsongoldproductionroyalty
Other	(423)	(246)
CASH PROVIDED BY FINANCING ACTIVITIES	34,115	133,960
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(91,274)	66,242
Cash and cash equivalents at beginning of period	270,861	206,690
Cash and cash equivalents at end of period	$ 179,587	$ 272,932

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