Coeur Mining (CDE) 10-K 20 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 17, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	COEUR MINING, INC.
Entity Central Index Key	215466
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	CDE
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		103,342,296
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$945,619,031

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Total Revenue	$635,742		$745,994		$895,492
COSTS AND EXPENSES
Costs applicable to sales	477,945	[1]	463,663	[1]	454,562	[1]
Amortization	162,436		229,564		216,032
General and administrative	40,845		55,343		32,977
Exploration	21,740		22,360		26,270
Litigation settlement	0		32,046		0
Write-downs	1,472,721		772,993		5,825
Pre-development, reclamation, and other	26,037		15,184		4,086
Total cost and expenses	2,201,724		1,591,153		739,752
OTHER INCOME (EXPENSE), NET
Loss on extinguishment of debt	0		0		-1,036
Fair value adjustments, net	3,618		82,768		-23,487
Impairment of equity securities	-6,593		-18,308		-605
Interest income and other, net	1,375		13,323		15,041
Interest expense, net of capitalized interest	-47,546		-41,303		-26,169
Total other income (expense), net	-49,146		36,480		-36,256
Total	-1,615,128		-808,679		119,484
Income and mining tax (expense) benefit	459,244		158,116		-70,807
NET INCOME (LOSS)	-1,155,884		-650,563		48,677
Other Comprehensive Income (Loss), Net of Tax:
Unrealized gain (loss) on equity securities, net of tax of $1,446 and $5,362 in 2014 and 2013, respectively	-2,290		-8,489		-3,351
Reclassification adjustments for impairment of equity securities, net of tax of $(2,552) and $(7,087) in 2014 and 2013, respectively	4,042		11,221		605
Reclassification adjustments for realized loss on sale of equity securities, net of tax of $(219) and $(53) in 2014 and 2013, respectively	346		83		0
Other comprehensive income (loss)	2,098		2,815		-2,746
COMPREHENSIVE INCOME (LOSS)	($1,153,786)		($647,748)		$45,931
NET INCOME (LOSS) PER SHARE
Basic (in dollars per share)	($11.28)		($6.65)		$0.54
Diluted (in dollars per share)	($11.28)		($6.65)		$0.54
[1]	Excludes amortization.

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$1,466	$5,362	$0
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, Net of Tax	-2,552	-7,087	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	($219)	($53)	$0

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	($1,155,884)	($650,563)	$48,677
Adjustments:
Amortization	162,436	229,564	216,032
Accretion	16,246	20,810	24,550
Deferred income taxes	-470,897	-177,178	16,163
Loss on termination of revolving credit facility	-3,035	0	-1,036
Fair value adjustments, net	-3,721	-80,399	18,421
Litigation settlement	0	22,046	0
Stock-based compensation	9,288	4,812	8,010
(Gain) loss on sale of assets	-35	-9,801	1,101
Impairment of marketable securities	6,593	18,308	605
Write-downs	1,472,721	772,993	5,825
Other	-359	-744	-1,707
Changes in operating assets and liabilities:
Receivables	-20,609	663	9,756
Prepaid expenses and other current assets	5,635	-15,165	2,489
Inventory and ore on leach pads	12,971	4,031	-48,305
Accounts payable and accrued liabilities	15,507	-25,910	-31,019
CASH PROVIDED BY OPERATING ACTIVITIES	52,927	113,467	271,634
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	-64,244	-100,813	-115,641
Acquisitions	-21,329	-116,898	-29,297
Purchase of short term investments and marketable securities	-50,513	-8,052	-12,959
Sales and maturities of short term investments	54,344	34,796	21,695
Other	8	4,478	3,087
CASH USED IN INVESTING ACTIVITIES	-81,734	-186,489	-133,115
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of notes and bank borrowings	167,784	300,000	0
Payments on long-term debt, capital leases, and associated costs	-25,902	-60,628	-97,170
Gold production royalty payments	-48,395	-57,034	-74,734
Share repurchases	0	-27,552	-19,971
Other	-509	-514	3,784
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:	92,978	154,272	-188,091
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	64,171	81,250	-49,572
Cash and cash equivalents at beginning of period	206,690	125,440	175,012
Cash and cash equivalents at end of period	$270,861	$206,690	$125,440

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
CURRENT ASSETS
Cash and cash equivalents	$270,861	$206,690
Receivables	116,921	81,074
Ore on leach pads	48,204	50,495
Inventory	114,931	132,023
Deferred tax assets	7,364	35,008
Prepaid expenses and other	15,523	25,940
Assets, Current	573,804	531,230
NON-CURRENT ASSETS
Property, plant, and equipment, net	227,911	486,273
Mining properties, net	501,192	1,751,501
Ore on leach pads	37,889	31,528
Restricted assets	7,037	7,014
Equity securities	5,982	14,521
Receivables	21,686	36,574
Debt issuance costs, net	9,851	10,812
Deferred tax assets	60,151	1,189
Other	9,915	15,336
TOTAL ASSETS	1,455,418	2,885,978
CURRENT LIABILITIES
Accounts payable	49,052	53,847
Accrued liabilities and other	51,513	38,266
Debt	17,498	2,505
Royalty obligations	43,678	48,019
Reclamation	3,871	913
Deferred tax liabilities	8,078	1,011
Current liabilities	173,690	144,561
NON-CURRENT LIABILITIES
Debt	460,899	306,130
Royalty obligations	27,651	65,142
Reclamation	66,943	57,515
Deferred tax liabilities	111,006	556,246
Other long-term liabilities	29,911	25,817
Non-current liabilities	696,410	1,010,850
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	1,034	1,028
Additional paid-in capital	2,789,695	2,781,164
Accumulated other comprehensive loss	-2,808	-4,906
Accumulated deficit	-2,202,603	-1,046,719
Stockholders' equity	585,318	1,730,567
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$1,455,418	$2,885,978

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
STOCKHOLDERS' EQUITY
Common stock, par value	$0.01	$0.01
Common stock, share authorized	150,000,000	150,000,000
Common stock, share issued	103,384,408	102,843,003

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Joaquin Project - Argentina [Member]	Joaquin Project - Argentina [Member]	Joaquin Project - Argentina [Member]	Joaquin Project - Argentina [Member]	Joaquin Project - Argentina [Member]	Orko Silver Corporation	Orko Silver Corporation	Orko Silver Corporation	Orko Silver Corporation	Orko Silver Corporation	Global Royalty Corporation	Global Royalty Corporation	Global Royalty Corporation	Global Royalty Corporation	Global Royalty Corporation
In Thousands, unless otherwise specified							Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss		Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss		Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Stockholders' equity, Beginning of Period at Dec. 31, 2011	$2,136,721	$897	$2,585,632	($444,833)	($4,975)
Balances, in shares at Dec. 31, 2011		89,655
Increase (Decrease) in Stockholders' Equity
Net income (loss)	48,677	0	0	48,677	0
Other comprehensive loss	-2,746	0	0	0	-2,746
Common stock share buyback, shares		-893
Common stock share buyback	-19,971	-9	-19,962	0	0
Common stock issued for acquisition, shares							1,310
Common stock issued for acquisition						30,000	13	29,987	0	0
Common stock issued under long-term incentive plans, net	5,599	2	5,597	0	0
Common stock issued under long-term incentive plans, net, in shares		270
Stockholders' equity, End of Period at Dec. 31, 2012	2,198,280	903	2,601,254	-396,156	-7,721
Balances, in shares at Dec. 31, 2012		90,342
Increase (Decrease) in Stockholders' Equity
Net income (loss)	-650,563	0	0	-650,563	0
Other comprehensive loss	2,815	0	0	0	2,815
Common stock share buyback, shares		-1,691
Common stock share buyback	-27,552	-17	-27,535	0	0
Common stock issued for acquisition, shares												11,573					2,130
Common stock issued for acquisition											179,140	116	179,024	0	0	22,198	21	22,177	0	0
Common stock issued under long-term incentive plans, net	6,249	5	6,244	0	0
Common stock issued under long-term incentive plans, net, in shares		489
Stockholders' equity, End of Period at Dec. 31, 2013	1,730,567	1,028	2,781,164	-1,046,719	-4,906
Balances, in shares at Dec. 31, 2013		102,843
Increase (Decrease) in Stockholders' Equity
Net income (loss)	-1,155,884	0	0	-1,155,884	0
Other comprehensive loss	2,098	0	0	0	2,098
Common stock issued under long-term incentive plans, net	8,537	6	8,531	0	0
Common stock issued under long-term incentive plans, net, in shares		541
Stockholders' equity, End of Period at Dec. 31, 2014	$585,318	$1,034	$2,789,695	($2,202,603)	($2,808)
Balances, in shares at Dec. 31, 2014		103,384

Basis_of_Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2014
Basis of Presentation [Abstract]
BASIS OF PRESENTATION	NATURE OF OPERATIONS
	Coeur Mining, Inc. (“Coeur” or “the Company”) is a large silver producer with significant gold production and mines located in the United States, Mexico, and Bolivia; streaming and royalty interests in Australia, New Zealand, Mexico, Ecuador, and Chile; and exploration projects in Mexico and Argentina. The Company operates the Palmarejo, San Bartolomé, Kensington, and Rochester mines, and owns the Endeavor silver stream, all of which constitute the Company's principal sources of revenues.

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Use of Estimates
	The Company's Consolidated Financial Statements have been prepared in accordance with United States Generally Accepted Accounting Principles. The preparation of the Company's Consolidated Financial Statements requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations, environmental, reclamation and closure obligations, estimates of recoverable silver and gold in leach pad inventories, estimates of fair value for certain reporting units and asset impairments, valuation allowances for deferred tax assets, and the fair value and accounting treatment of financial instruments, equity securities, and derivative instruments. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results will differ from the amounts estimated in these financial statements.
	Principles of Consolidation
	The Consolidated Financial Statements include the wholly-owned subsidiaries of the Company, the most significant of which are Empresa Minera Manquiri S.A., Coeur Mexicana S.A. de C.V., Coeur Rochester, Inc., Coeur Alaska, Inc., and Coeur Capital, Inc. All intercompany balances and transactions have been eliminated. The Company's investments in entities in which it has less than 20% ownership interest are accounted for using the cost method.
	Revenue Recognition
	Revenue is recognized, net of treatment and refining charges, when persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed or determinable, no obligations remain and collection is probable.
	Under the Company’s concentrate sales contracts with third-party smelters, gold and silver prices are set on a specified future quotational period, typically one to three months, after the shipment date based on market prices. Revenues and costs applicable to sales are recorded on a gross basis under these contracts at the time title passes to the buyer based on the forward price for the expected settlement period. The contracts, in general, provide for provisional payment based upon provisional assays and forward metal prices. Final settlement is based on the average applicable price for the specified future quotational period and generally occurs from three to six months after shipment. The Company’s provisionally priced sales contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of concentrates measured at the forward price at the time of sale. The embedded derivative does not qualify for hedge accounting and is adjusted to fair value through revenue each period until the date of final gold and silver settlement.
	Cash and Cash Equivalents
	Cash and cash equivalents include all highly-liquid investments with an original maturity of three months or less. The Company minimizes its credit risk by investing its cash and cash equivalents with major U.S. and international banks and financial institutions located principally in the United States with a minimum credit rating of A1, as defined by Standard & Poor’s. The Company’s management believes that no concentration of credit risk exists with respect to the investment of its cash and cash equivalents.
	Receivables
	Trade receivables and other receivable balances are reported at outstanding principal amounts, net of an allowance for doubtful accounts, if deemed necessary. Management evaluates the collectability of receivable account balances to determine the allowance, if any. Management considers the other party's credit risk and financial condition, as well as current and projected economic and market conditions, in determining the amount of the allowance. Receivable balances are written off when management determines that the balance is uncollectible.
	Ore on Leach Pads
	The heap leach process extracts silver and gold by placing ore on an impermeable pad and applying a diluted cyanide solution that dissolves a portion of the contained silver and gold, which are then recovered in metallurgical processes.
	The Company uses several integrated steps to scientifically measure the metal content of ore placed on the leach pads. As the ore body is drilled in preparation for the blasting process, samples are taken of the drill residue which are assayed to determine estimated quantities of contained metal. The Company estimates the quantity of ore by utilizing global positioning satellite survey techniques. The Company then processes the ore through crushing facilities where the output is again weighed and sampled for assaying. A metallurgical reconciliation with the data collected from the mining operation is completed with appropriate adjustments made to previous estimates. The crushed ore is then transported to the leach pad for application of the leaching solution. As the leach solution is collected from the leach pads, it is continuously sampled for assaying. The quantity of leach solution is measured by flow meters throughout the leaching and precipitation process. After precipitation, the product is converted to doré, which is the final product produced by the mine. The inventory is stated at lower of cost or market, with cost being determined using a weighted average cost method.
	The historical cost of the metal that is expected to be extracted within twelve months is classified as current and the historical cost of metals contained within the broken ore that is expected to be extracted beyond twelve months is classified as non-current. Ore on leach pad is valued based on actual production costs incurred to produce and place ore on the leach pad, less costs allocated to minerals recovered through the leach process.
	The estimate of both the ultimate recovery expected over time and the quantity of metal that may be extracted relative to the time the leach process occurs requires the use of estimates, which are inherently inaccurate due to the nature of the leaching process. The quantities of metal contained in the ore are based upon actual weights and assay analysis. The rate at which the leach process extracts gold and silver from the crushed ore is based upon laboratory column tests and actual experience occurring over more than twenty years of leach pad operations at the Rochester mine. The assumptions used by the Company to measure metal content during each stage of the inventory conversion process includes estimated recovery rates based on laboratory testing and assaying. The Company periodically reviews its estimates compared to actual experience and revises its estimates when appropriate. Variations between actual and estimated quantities resulting from changes in assumptions and estimates that do not result in write-downs to net realizable value are accounted for on a prospective basis.
	Metal and Other Inventory
	Inventories include concentrate, doré, and operating materials and supplies. The classification of inventory is determined by the stage at which the ore is in the production process. All inventories are stated at the lower of cost or market, with cost being determined using a weighted average cost method. Concentrate and doré inventory includes product at the mine site and product held by refineries. Concentrate inventories associated with the Endeavor mine are held by third parties. Metal inventory costs include direct labor, materials, depreciation, depletion and amortization as well as overhead costs relating to mining activities.
	Property, Plant, and Equipment
	Expenditures for new facilities, assets acquired pursuant to capital leases, new assets or expenditures that extend the useful lives of existing facilities are capitalized and depreciated using the straight-line method at rates sufficient to depreciate such costs over the shorter of estimated productive lives of such facilities, lease term, or the useful life of the individual assets. Productive lives range from 7 to 30 years for buildings and improvements and 3 to 10 years for machinery and equipment. Certain mining equipment is depreciated using the units-of-production method based upon estimated total proven and probable reserves.
	Mining Properties and Mine Development
	Capitalization of mine development costs begins once all operating permits have been secured, mineralization is classified as proven and probable reserves and a final feasibility study has been completed. Mine development costs include engineering and metallurgical studies, drilling and other related costs to delineate an ore body, the removal of overburden to initially expose an ore body at open pit surface mines and the building of access ways, shafts, lateral access, drifts, ramps and other infrastructure at underground mines. Costs incurred before mineralization is classified as proven and probable reserves are expensed and classified as exploration or pre-development expense. Mine development costs are amortized using the units of production method over the estimated life of the ore body based on recoverable ounces to be mined from proven and probable reserves. Interest expense allocable to the cost of developing mining properties and to construct new facilities is capitalized until assets are ready for their intended use.
	Drilling and related costs incurred at the Company’s operating mines are expensed as incurred in Exploration, unless the Company can conclude with a high degree of confidence, prior to the commencement of a drilling program, that the drilling costs will result in the conversion of a mineral resource into proven and probable reserves. The Company’s assessment is based on the following factors: results from previous drill programs; results from geological models; results from a mine scoping study confirming economic viability of the resource; and preliminary estimates of mine inventory, ore grade, cash flow and mine life. In addition, the Company must have all permitting and/or contractual requirements necessary to have the right to and/or control of the future benefit from the targeted ore body. The costs of a drilling program that meet these criteria are capitalized as mine development costs. Drilling and related costs of approximately $8.9 million and $11.6 million at December 31, 2014 and 2013, respectively, were capitalized.
	The cost of removing overburden and waste materials to access the ore body at an open pit mine prior to the production phase are referred to as “pre-stripping costs.” Pre-stripping costs are capitalized during the development of an open pit mine. Stripping costs incurred during the production phase of a mine are variable production costs that are included as a component of inventory to be recognized in Costs applicable to sales in the same period as the revenue from the sale of inventory.
	Mineral Interests
	Significant payments related to the acquisition of land and mineral rights are capitalized. Prior to acquiring such land or mineral rights, the Company generally makes a preliminary evaluation to determine that the property has significant potential to develop an economic ore body. The time between initial acquisition and full evaluation of a property’s potential is variable and is determined by many factors including: location relative to existing infrastructure, the property’s stage of development, geological controls and metal prices. If a mineable ore body is discovered, such costs are amortized when production begins using the units-of-production method based on recoverable ounces to be mined from proven and probable reserves. If no mineable ore body is discovered, such costs are expensed in the period in which it is determined the property has no future economic value.
	Write-downs
	We review and evaluate our long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Asset impairment is considered to exist if the total estimated undiscounted pre-tax future cash flows are less than the carrying amount of the asset. In estimating future cash flows, assets are grouped at the lowest level for which there is identifiable cash flows that are largely independent of future cash flows from other asset groups. An impairment loss is measured and recorded based on discounted estimated future cash flows. Future cash flows are estimated based on estimated quantities of recoverable minerals, expected silver and gold prices (considering current and historical prices, trends and related factors), production levels, operating costs, capital requirements and reclamation costs, all based on life-of-mine plans. The significant assumptions used in determining future cash flows for each mine site asset group at December 31, 2014, apart from production cost and capitalized expenditure assumptions unique to each operation, included long-term silver and gold prices of $19.00 and $1,275 per ounce (consistent with the Company’s long-term reserve prices), respectively, and discount rates ranging from 8.0% - 10.75% (to reflect project and country-specific risks). During 2014, 2013, and 2012, we recorded impairments of $1,472.7 million, $773.0 million, and $5.8 million, respectively, to reduce the carrying value of mining properties and property, plant and equipment as part of Write-downs. See Note 4 -- Write-Downs for additional detail.
	Existing proven and probable reserves and value beyond proven and probable reserves, including mineralization other than proven and probable reserves are included when determining the fair value of mine site asset groups at acquisition and, subsequently, in determining whether the assets are impaired. The term “recoverable minerals” refers to the estimated amount of silver and gold that will be obtained after taking into account losses during ore processing and treatment. Estimates of recoverable minerals from exploration stage mineral interests are risk adjusted based on management’s relative confidence in such materials. The ability to achieve the estimated quantities of recoverable minerals from exploration stage mineral interests involves further risks in addition to those risk factors applicable to mineral interests where proven and probable reserves have been identified, due to the lower level of confidence that the identified mineralized material could ultimately be mined economically. Assets classified as exploration potential have the highest level of risk that the carrying value of the asset can be ultimately realized, due to the still lower level of geological confidence and economic modeling.
	Silver and gold prices are volatile and affected by many factors beyond the Company’s control, including prevailing interest rates and returns on other asset classes, expectations regarding inflation, speculation, currency values, governmental decisions regarding precious metals stockpiles, global and regional demand and production, political and economic conditions and other factors may affect the key assumptions used in the Company’s impairment testing. Various factors could impact our ability to achieve forecasted production levels from proven and probable reserves. Additionally, production, capital and reclamation costs could differ from the assumptions used in the cash flow models used to assess impairment. Actual results may vary from the Company’s estimates and result in additional Write-downs.
	Restricted Assets
	The Company, under the terms of its self-insurance and bonding agreements with certain banks, lending institutions and regulatory agencies, is required to collateralize certain portions of its obligations. The Company has collateralized these obligations by assigning certificates of deposit that have maturity dates ranging from three months to a year, to the respective institutions or agencies. At December 31, 2014 and 2013, the Company held certificates of deposit and cash under these agreements of $7.0 million and $7.0 million, respectively, restricted for these purposes. The ultimate timing of the release of the collateralized amounts is dependent on the timing and closure of each mine and repayment of the facility. In order to release the collateral, the Company must seek approval from certain government agencies responsible for monitoring the mine closure status. Collateral could also be released to the extent the Company is able to secure alternative financial assurance satisfactory to the regulatory agencies. The Company believes there is a reasonable probability that the collateral will remain in place beyond a twelve-month period and has therefore classified these investments as long-term.
	Reclamation and Remediation Costs
	The Company recognizes obligations for the expected future retirement of tangible long-lived assets and other associated asset retirement costs. The fair value of a liability for an asset retirement obligation will be recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The fair value of the liability is added to the carrying amount of the associated asset and this additional carrying amount is depreciated over the life of the asset. An accretion cost, representing the increase over time in the present value of the liability, is recorded each period in Pre-development, reclamation, and other. As reclamation work is performed or liabilities are otherwise settled, the recorded amount of the liability is reduced. Future remediation costs for inactive mines are accrued based on management’s best estimate at the end of each period of the discounted costs expected to be incurred at the site. Such cost estimates include, where applicable, ongoing care and maintenance and monitoring costs. Changes in estimates are reflected prospectively in the period an estimate is revised.
	Foreign Currency
	The assets and liabilities of the Company’s foreign subsidiaries are measured using U.S. dollars as their functional currency. Revenues and expenses are translated at the average exchange rate for the period. Foreign currency transaction gains and losses are included in the determination of net income or loss.
	Derivative Financial Instruments
	The Company recognizes all derivatives as either assets or liabilities on the balance sheet and measures those instruments at fair value. Changes in the value of derivative instruments are recorded each period in the Consolidated Statement of Comprehensive Income (Loss) in Fair value adjustments, net. Management applies judgment in estimating the fair value of instruments that are highly sensitive to assumptions regarding commodity prices, market volatilities, and foreign currency exchange rates.
	Stock-based Compensation Plans
	The Company estimates the fair value of stock options using the Black-Scholes option pricing model and stock appreciation rights (“SARs”) awards using market comparison. Stock options granted are accounted for as equity-based awards and SARs are accounted for as liability-based awards. The value of the SARs is remeasured at each reporting date. The Company estimates the fair value of performance share and performance unit grants using a Monte Carlo simulation valuation model. Performance shares granted are accounted for as equity based awards and performance shares units are accounted for as liability-based awards. The Company estimates forfeitures of stock-based awards based on historical data and periodically adjusts the forfeiture rate. The adjustment of the forfeiture rate is recorded as a cumulative adjustment in the period the forfeiture estimate is changed. Compensation costs related to stock based compensation are included in General and administrative expenses, Costs applicable to sales, and Property, plant, and equipment, net as deemed appropriate.
	Restricted stock and restricted stock units granted under the Company’s incentive plans are accounted for based on the market value of the underlying shares on the date of grant and vest in equal installments annually over three years. Restricted stock awards are accounted for as equity-based awards and restricted stock unit awards are accounted for as liability-based awards. Restricted stock units are remeasured at each reporting date. Restricted stock units are settled in cash based on the number of vested restricted stock units multiplied by the current market price of the common shares when vested. Holders of the restricted stock are entitled to vote the shares and to receive any dividends declared on the shares.
	Income and Mining Taxes
	The Company uses an asset and liability approach which results in the recognition of deferred tax liabilities and assets for the expected future tax consequences or benefits of temporary differences between the financial reporting basis and the tax basis of assets and liabilities, as well as operating loss and tax credit carryforwards, using enacted tax rates in effect in the years in which the differences are expected to reverse.
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of its deferred tax assets will not be realized. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. A valuation allowance has been provided for the portion of the Company’s net deferred tax assets for which it is more likely than not that they will not be realized.
	Recent Accounting Standards
	In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." The updated guidance provides a five-step approach to be applied to all contracts with customers and also requires expanded disclosures about revenue recognition. These changes become effective prospectively for the Company's fiscal year beginning January 1, 2017. The Company is currently evaluating the potential impact of these changes on the Company's consolidated financial position, results of operations, and cash flows.

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING
	The Company’s operating segments include the Palmarejo, San Bartolomé, Rochester, and Kensington mines, La Preciosa, and Coeur Capital. All operating segments are engaged in the discovery and mining of gold and silver and generate the majority of their revenues from the sale of these precious metals with the exception of Coeur Capital, which holds the Endeavor silver stream and other precious metals royalties. Other includes the Joaquin project, Martha mine, corporate headquarters, elimination of intersegment transactions, and other items necessary to reconcile to consolidated amounts.
	Revenues from silver sales were $328.5 million, $394.5 million and $549.7 million in 2014, 2013, and 2012, respectively. Revenues from gold sales were $304.0 million, $351.5 million and $345.8 million in 2014, 2013, and 2012, respectively.
	Financial information relating to the Company’s segments is as follows (in thousands):
	Year ended December 31, 2014	Palmarejo			San Bartolomé			Kensington			Rochester			La Preciosa			Coeur Capital			Other			Total
		Mine			Mine			Mine			Mine
	Revenue
	Metal sales	$	244,003		$	117,749		$	136,960		$	123,768		$	—		$	10,046		$	—		$	632,526
	Royalties	—			—			—			—			—			3,216			—			3,216
		244,003			117,749			136,960			123,768			—			13,262			—			635,742
	Costs and Expenses
	Costs applicable to sales(1)	187,276			89,659			105,342			91,462			—			4,206			—			477,945
	Amortization	69,431			19,423			43,619			20,790			84			7,015			2,074			162,436
	Exploration	6,671			120			8,005			2,636			236			515			3,557			21,740
	Write-downs	784,038			118,754			107,832			—			372,466			6,202			83,429			1,472,721
	Other operating expense (income)	620			(251		)	796			2,813			13,961			938			48,005			66,882
	Other income (expense)
	Interest income and other, net	131			2,461			(22		)	105			(523		)	(7,141		)	(229		)	(5,218		)
	Interest expense, net	(9,320		)	(52		)	(214		)	(679		)	—			(1		)	(37,280		)	(47,546		)
	Fair value adjustments, net	(1,847		)	—			—			3,653			—			—			1,812			3,618
	Income and mining tax (expense) benefit	283,685			18,114			—			(2,224		)	132,151			1,212			26,306			459,244
	Net income (loss)	$	(531,384	)	$	(89,433	)	$	(128,870	)	$	6,922		$	(255,119	)	$	(11,544	)	$	(146,456	)	$	(1,155,884	)
	Segment assets(2)	$	341,367		$	188,616		$	215,973		$	196,765		$	39,701		$	59,848		$	41,987		$	1,084,257
	Capital expenditures	$	26,084		$	7,937		$	16,220		$	11,898		$	255		$	—		$	1,850		$	64,244
	(1) Excludes amortization
	(2) Segment assets include receivables, prepaids, inventories, property, plant, and equipment, and mineral interests
	Year ended December 31, 2013	Palmarejo			San Bartolomé			Kensington			Rochester			La Preciosa			Coeur Capital			Other			Total
		Mine			Mine			Mine			Mine
	Revenue
	Metal sales	$	324,040		$	141,721		$	148,769		$	119,254		$	—		$	12,871		$	(661	)	$	745,994
	Royalties	—			—			—			—			—			—			—			—
		324,040			141,721			148,769			119,254			—			12,871			(661		)	745,994
	Costs and Expenses
	Costs applicable to sales(1)	188,572			86,827			104,575			77,869			—			5,820			—			463,663
	Amortization	133,535			19,103			62,750			8,890			24			3,755			1,507			229,564
	Exploration	7,161			111			4,199			2,653			80			2,069			6,087			22,360
	Write-downs	642,094			—			130,694			—			—			—			205			772,993
	Other operating expense (income)	705			6,205			735			36,265			3,237			1,397			54,029			102,573
	Other income (expense)
	Interest income and other, net	906			2,582			(187		)	(318		)	15			(19,474		)	11,491			(4,985		)
	Interest expense, net	(15,123		)	(74		)	(424		)	(20		)	—			—			(25,662		)	(41,303		)
	Fair value adjustments, net	76,218			—			7,480			416			—			—			(1,346		)	82,768
	Income and mining tax (expense) benefit	107,748			(10,938		)	(1		)	(2,332		)	(20,856		)	2,179			82,316			158,116
	Net income (loss)	$	(478,278	)	$	21,045		$	(147,316	)	$	(8,677	)	$	(24,182	)	$	(17,465	)	$	4,310		$	(650,563	)
	Segment assets(2)	$	1,164,852		$	289,272		$	343,144		$	176,789		$	410,335		$	62,678		$	111,749		$	2,558,819
	Capital expenditures	$	33,730		$	11,568		$	21,404		$	29,406		$	1,122		$	—		$	3,583		$	100,813
	(1) Excludes amortization
	(2) Segment assets include receivables, prepaids, inventories, property, plant, and equipment, and mineral interests
	Year ended December 31, 2012	Palmarejo			San Bartolomé			Kensington			Rochester			Coeur Capital			Other			Total
		Mine			Mine			Mine			Mine
	Revenue
	Metal sales	$	442,098		$	178,005		$	110,987		$	132,392		$	18,848		$	13,162		$	895,492
	Royalties	—			—			—			—			—			—			—
		442,098			178,005			110,987			132,392			18,848			13,162			895,492
	Costs and Expenses
	Costs applicable to sales(1)	197,478			71,428			87,089			72,061			8,824			17,682			454,562
	Amortization	145,945			16,624			41,241			6,784			4,632			806			216,032
	Exploration	7,575			159			3,283			3,591			1,056			10,606			26,270
	Write-downs	—			—			—			—			—			5,825			5,825
	Other operating expense (income)	661			165			478			2,682			(736		)	33,813			37,063
	Other income (expense)
	Interest income and other, net	4,017			9,719			(77		)	358			(77		)	496			14,436
	Interest expense, net	(18,938		)	(72		)	(2,972		)	(26		)	—			(4,161		)	(26,169		)
	Loss on debt extinguishment	—			—			(1,036		)	—			—			—			(1,036		)
Fair value adjustments, net	(31,054		)	—			4,089			—			—			3,478			(23,487		)
Income and mining tax (expense) benefit	(18,066		)	(44,632		)	—			(2,195		)	(327		)	(5,587		)	(70,807		)
Net income (loss)	$	26,398		$	54,644		$	(21,100	)	$	45,411		$	4,668		$	(61,344	)	$	48,677
Segment assets(2)	$	1,905,269		$	302,922		$	508,658		$	104,373		$	32,656		$	120,178		$	2,974,056
Capital expenditures	$	38,456		$	25,672		$	36,994		$	11,794		$	—		$	2,725		$	115,641
(1) Excludes amortization
(2) Segment assets include receivables, prepaids, inventories, property, plant, and equipment, and mineral interests
In thousands	December 31, 2014			December 31, 2013
Assets
Total assets for reportable segments	$	1,084,257		$	2,558,819
Cash and cash equivalents	270,861			206,690
Other assets	100,300			120,469
Total consolidated assets	$	1,455,418		$	2,885,978
Geographic Information
In thousands	December 31, 2014			December 31, 2013
Long Lived Assets
Mexico	$	298,101		$	1,487,228
United States	275,594			384,626
Bolivia	107,960			235,085
Australia	21,362			25,668
Argentina	10,970			94,705
Other	15,116			10,462
Total	$	729,103		$	2,237,774
	Year ended December 31,
In thousands	2014			2013			2012
Revenue
United States	$	260,728		$	268,023		$	243,379
Mexico	245,493			324,040			442,098
Bolivia	117,749			141,721			178,005
Australia	10,046			12,871			18,848
Other	$	1,726		$	(661	)	$	13,162
Total	$	635,742		$	745,994		$	895,492
The Company's doré is refined into gold and silver bullion according to benchmark standards set by the London Bullion Market Association, which regulates the acceptable requirements for bullion traded in the London precious metals markets. The Company then sells its silver and gold bullion to multi-national banks, bullion trading houses, and refiners across the globe. The Company has seven bullion trading counterparties and the sales of metals to these companies amounted to approximately 63%, 72%, and 91% of total metal sales for the years ended December 31, 2014, 2013, and 2012, respectively. Generally, the loss of a single bullion trading counterparty would not adversely affect the Company due to sufficient liquidity of the markets and ample alternative trading counterparties.
The Company's concentrates are sold to smelters under purchase and sale agreements, and the smelters pay the Company for the gold or silver recovered from the concentrates. The Company currently has seven smelting and refining customers for its concentrates, and the sales to these companies amounted to approximately 37%, 28%, and 9% of total metal sales for the years ended December 31, 2014, 2013, and 2012, respectively. The loss of any one smelting and refining client may have a material adverse effect on sales if alternate smelters and refiners are not available. The Company believes sufficient global capacity exists in case of the loss of any one smelter.
The following table indicates customers that represent 10% or more of total sales of metal for at least one of the years December 31, 2014, 2013, and 2012 (in millions):
		Years Ended December 31,
Customer		2014			2013			2012			Segments reporting revenue
Mitsui & Co.		$	133.8		$	70.3		$	65.6		Palmarejo, Rochester
TD Securities		106.7			106.7			65.8			Palmarejo, Rochester
Standard Bank		87.5			69			72.3			Palmarejo, Rochester
China National Gold		86.8			81.5			43.8			Kensington
Johnson Matthey		71.8			66.4			1.7			San Bartolomé
Valcambi		33.9			77.2			414.4			Palmarejo, San Bartolomé
INTL Commodities		22.4			84.6			58			Palmarejo, San Bartolomé, Rochester
Auramet		10.8			111.7			94.6			Palmarejo, San Bartolomé, Kensington, Rochester

WriteDowns

Write-Downs	12 Months Ended
	Dec. 31, 2014
Details of Impairment by Long-Lived Asset Class [Abstract]
WRITE-DOWNS	WRITE-DOWNS
		Year ended December 31,
		2014		2013		2012
	Mining properties
	Palmarejo	668,803		539,359		—
	San Bartolomé	32,328		—		—
	Kensington	67,671		82,337		—
	La Preciosa	371,411		—		—
	Joaquin	83,429		—		—
	Coeur Capital (El Gallo)	6,202		—		—
	Martha	—		205		5,825
		1,229,844		621,901		5,825
	Property, plant, and equipment
	Palmarejo	$	115,235	$	102,735	$	—
	San Bartolomé	86,426		—		—
	Kensington	40,161		48,357		—
	La Preciosa	1,055		—		—
		242,877		151,092		—
	Total	$	1,472,721	$	772,993	$	5,825
	The 2014 write-down of $1,472.7 million ($1,021.8 million net of tax) was primarily due to a $784.0 million impairment of the Palmarejo mine ($504.5 million net of tax) and a $372.5 million impairment of the La Preciosa project ($244.9 million net of tax). The non-cash impairment charges were largely driven by significant decreases in long-term metal price assumptions and revised mine plans in the fourth quarter. For purposes of this evaluation, estimates of future cash flows of the individual reporting units were used to determine fair value. The estimated cash flows were derived from life-of-mine plans, developed using long-term pricing reflective of the current price environment and management’s projections for operating costs.
	The 2013 write-down of $773.0 million was primarily due to a $642.1 million impairment of the Palmarejo mine ($462.3 million net of tax) and a $130.7 million impairment of the Kensington mine due to a decrease in the Company's long-term silver and gold price assumptions reflective of the current silver and gold price environment.
	The 2012 write-down of $5.8 million was due to the cessation of mining operations at the Martha Mine.

Reclamation

Reclamation	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
RECLAMATION	RECLAMATION
	Reclamation and mine closure costs are based principally on legal and regulatory requirements. Management estimates costs associated with reclamation of mining properties. The Company uses assumptions about future costs, mineral prices, mineral processing recovery rates, production levels, capital costs, and reclamation costs. On an ongoing basis, management evaluates its estimates and assumptions, and future expenditures could differ from current estimates.
	Changes to the Company’s asset retirement obligations (included in Reclamation) are as follows:
	In thousands	Year ended December 31,
		2014			2013
	Asset retirement obligation - Beginning	$	55,966		$	33,008
	Accretion	4,826			3,316
	Additions and changes in estimates	6,748			19,670
	Settlements	(326		)	(28		)
	Asset retirement obligation - Ending	$	67,214		$	55,966
	The Company has accrued $3.6 million and $2.5 million at December 31, 2014 and December 31, 2013, respectively, for reclamation liabilities related to former mining activities. These amounts are also included in Reclamation.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION
	The Company has stock incentive plans for executives and eligible employees. Stock awards include stock options, restricted stock, and performance shares. The Company previously awarded stock appreciation rights, restricted stock units, and performance share units. Stock-based compensation expense for the years ended December 31, 2014, 2013, and 2012 was $9.3 million, $4.8 million, and $8.0 million, respectively. At December 31, 2014, there was $8.7 million of unrecognized stock-based compensation cost which is expected to be recognized over a weighted-average remaining vesting period of 1.6 years.
	Stock Options and Stock Appreciation Rights
	Stock options and stock appreciation rights (SARs) granted under the Company’s incentive plans vest over three years and are exercisable over a period not to exceed ten years from the grant date. The exercise price of the stock options is equal to the fair market value of the shares on the date of the grant. The value of each stock option award is estimated using the Black-Scholes option pricing model. Stock options are accounted for as equity awards and SARs are accounted for as liability awards and remeasured at each reporting date. SARs, when vested, provide the participant the right to receive cash equal to the excess of the market price of the shares over the exercise price when exercised.
	The following table sets forth the weighted average fair value of stock options and the assumptions used to estimate the fair value of the stock options using the Black-Scholes option valuation model:
		2014				2013				2012
	Weighted average fair value of stock options granted	$	3.79			$	12.6			$	15.77
	Volatility	50.93		%		76.74		%		70.56		%
	Expected life in years	3.9				5				5.5
	Risk-free interest rate	1.25		%		0.84		%		0.89		%
	Dividend yield	—				—				—
	The following table summarizes stock option and SAR activity for the years ended December 31, 2014, 2013, and 2012:
		Stock Options							SARs
		Shares			Weighted				Shares			Weighted
					Average							Average
					Exercise							Exercise
					Price							Price
	Outstanding at December 31, 2011	321,607			$	24.6			107,639			$	13.46
	Granted	151,102			26.97				—			—
	Exercised	(40,173	)		11.84				(34,385	)		12.73
	Canceled/forfeited	(62,536	)		29.22				(4,389	)		15.4
	Outstanding at December 31, 2012	370,000			30.2				68,865			13.83
	Granted	190,452			20.41				—			—
	Exercised	(13,027	)		10.77				(6,617	)		13.14
	Canceled/forfeited	(131,855	)		29.3				(12,039	)		15.4
	Outstanding at December 31, 2013	415,570			27.36				50,209			14.15
	Granted	415,172			9.45				—			—
	Canceled/forfeited	(232,396	)		23.94				(3,637	)		15.4
	Outstanding at December 31, 2014	598,346			$	16.26			46,572			$	14.06
			Options Outstanding									Options Exercisable
	Range of		Number			Weighted Average				Weighted		Number		Weighted		Weighted
	Exercise Price		Outstanding			Exercise				Average		Exercisable		Average		Average
						Price				Remaining				Exercise		Remaining
										Contractual				Price		Contractual Life (Years)
										Life (Years)
	$ 0.00-$10.00		284,866			$	9.34			9.04		11,034		$	10	4.09
	$10.00-$20.00		121,540			15.51				8.43		33,646		17.33		8.11
	$20.00-$30.00		176,777			25.68				6.88		107,546		26.37		6.27
	$30.00-$40.00		9,566			38.25				2.44		9,566		38.25		2.44
	$40.00-$50.00		3,336			48.5				3.03		3,336		48.5		3.03
	$50.00-$60.00		2,261			51.4				1.14		2,261		51.4		1.14
			598,346			$	16.26					167,389		$	24.93
	At December 31, 2014, there was $0.7 million of unrecognized compensation cost related to non-vested stock options and SARs to be recognized over a weighted average period of 1.3 years.
	Restricted Stock and Restricted Stock Units
	Restricted stock granted under the Company’s incentive plans are accounted for based on the market value of the underlying shares on the date of grant and vest in equal installments annually over three years. Restricted stock awards are accounted for as equity awards and restricted stock unit awards were accounted for as liability awards. Restricted stock units were remeasured at each reporting date and settled in cash based on the number of vested restricted stock units multiplied by the current market price of the common shares when vested. Holders of restricted stock are entitled to vote the shares and to receive any dividends declared on the shares.
	The following table summarizes restricted stock and restricted stock units activity for the years ended December 31, 2014, 2013, and 2012:
		Restricted Stock							Restricted Stock Units
		Number of			Weighted				Number of			Weighted Average
		Shares			Average				Units			Fair Value
					Grant Date
					Fair Value
	Outstanding at December 31, 2011	173,509			11.37				45,518			27.32
	Granted	230,096			26.4				—			—
	Vested	(95,336	)		23.15				(31,456	)		25.92
	Cancelled/Forfeited	(68,571	)		27.43				(2,651	)		24.6
	Outstanding at December 31, 2012	239,698			25.38				11,411			24.14
	Granted	573,467			15.38				—			—
	Vested	(90,963	)		26.83				(11,411	)		22.74
	Cancelled/Forfeited	(109,116	)		23.3				—			—
	Outstanding at December 31, 2013	613,086			$	16.68			—			$	—
	Granted	695,897			9.83				—			—
	Vested	(234,103	)		17.16				—			—
	Cancelled/Forfeited	(172,881	)		11.87				—			—
	Outstanding at December 31, 2014	901,999			$	12.19			—			$	—
At December 31, 2014, there was $3.4 million of unrecognized compensation cost related to restricted stock and restricted stock unit awards to be recognized over a weighted-average period of 1.4 years.
Performance Shares and Performance Share Units
Performance shares granted under the Company’s incentive plans are accounted for at fair value using a Monte Carlo simulation valuation model on the date of grant. Performance share awards are accounted for as equity awards and performance units are accounted for as liability-based awards and remeasured each reporting date. Vesting is contingent on meeting certain market conditions based on relative total stockholder return and on meeting internal performance conditions. The performance shares vest at the end of the three-year service period if market and service conditions are met. The existence of a market condition requires recognition of compensation cost for the performance share awards over the requisite period regardless of whether the market condition is satisfied. Performance share units were settled in cash based on the current market price of the common shares when vested.
The following table summarizes performance shares and performance units’ activity for the years ended December 31, 2014, 2013, and 2012:
	Performance Shares							Performance Units
	Number of			Weighted				Number of			Weighted Average
	Shares			Average				Units			Fair Value
				Grant Date
				Fair Value
Outstanding at December 31, 2011	105,929			$	16.29			84,539			$	35.41
Granted	145,508			25.78				32,498			—
Vested	(111,703	)		7.96				(74,845	)		31.17
Cancelled/Forfeited	(30,575	)		42.11				(7,953	)		49.2
Outstanding at December 31, 2012	109,159			26.92				34,239			39.78
Granted	173,773			23.35				34,239			38.02
Vested	(4,160	)		30.97				(68,478	)		38.02
Cancelled/Forfeited	(68,377	)		34.49				—			—
Outstanding at December 31, 2013	210,395			28.04				—			—
Granted	358,398			12.21				—			—
Vested	(34,611	)		27.18				—			—
Cancelled/Forfeited	(17,352	)		27.15				—			—
Outstanding at December 31, 2014	516,830			$	17.61			—			$	—
At December 31, 2014, there was $2.9 million of unrecognized compensation cost related to performance shares to be recognized over a weighted average period of 1.8 years.
Supplemental Incentive Plan
During 2014, the Company adopted a supplemental incentive plan, under which benefits are payable upon achievement of certain performance and market conditions.  The maximum potential bonus under the plan is $3.8 million, of which $2.8 million may be settled in cash or stock at the Company’s discretion.  At December 31, 2014, $0.6 million has been accrued for this plan.

Retirement_Savings_Plan

Retirement Savings Plan	12 Months Ended
	Dec. 31, 2014
Postemployment Benefits [Abstract]
RETIREMENT SAVINGS PLAN	RETIREMENT SAVINGS PLAN
	The Company has a 401(k) retirement savings plan that covers all eligible U.S. employees. Eligible employees may elect to contribute up to 75% of base salary, subject to ERISA limitations. The Company makes matching contributions equal to 100% of the employee’s contribution up to 4% of the employee's compensation. The Company may also provide a voluntary, noncontributory defined contribution based on a percentage of eligible employee's salary. Total plan expenses recognized for the years ended December 31, 2014, 2013, and 2012 were $2.6 million, $4.1 million, and $4.1 million, respectively.

Income_and_Mining_Taxes

Income and Mining Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME AND MINING TAXES
	The components of Income (loss) before income taxes are below:
		Year ended December 31,
	in thousands	2014				2013			2012
	United States	$	(213,883	)		$	(242,562	)	$	(3,443	)
	Foreign	(1,401,245		)		(566,117		)	122,927
	Total	$	(1,615,128	)		$	(808,679	)	$	119,484
	The components of the consolidated Income and mining tax (expense) benefit from continuing operations are below:
		Year ended December 31,
	in thousands	2014				2013			2012
	Current:
	United States	$	904			$	4		$	(257	)
	United States — State mining taxes	(879		)		(714		)	(2,195		)
	United States — Foreign withholding tax	(6,250		)		397			(736		)
	Argentina	(71		)		(137		)	976
	Australia	—				(914		)	(1,760		)
	Mexico	(1,124		)		(9,046		)	(7,814		)
	Bolivia	(4,008		)		(6,716		)	(43,546		)
	Canada	(145		)		(1,936		)	—
	Deferred:
	Argentina	24,478				8,062			—
	Australia	(401		)		(2		)	(223		)
	Bolivia	22,122				(4,222		)	(1,087		)
	Canada	1,807				—			—
	Mexico	417,068				94,851			(10,579		)
	United States	5,743				78,489			(3,586		)
	Income tax (expense) benefit	$	459,244			$	158,116		$	(70,807	)
	A reconciliation of the Company’s effective tax rate with the federal statutory tax rate for the periods indicated is below:
		Year ended December 31,
	in thousands	2014				2013			2012
	Tax benefit (expense) from continuing operations	$	565,295			$	283,038		$	(41,819	)
	State tax provision from continuing operations	20,253				2,245			(3,151		)
	Percentage depletion and related deductions	—				—			7,461
	Change in valuation allowance	(128,344		)		(106,802		)	(12,651		)
	Non-deductible imputed interest	—				(214		)	(525		)
	Uncertain tax positions	(4,425		)		(5,209		)	(9,849		)
	U.S. and foreign non-deductible expenses	(4,892		)		(2,383		)	(4,206		)
	Foreign exchange rates	23,672				13,937			(10,416		)
	Foreign inflation and indexing	3,765				2,937			712
	Foreign tax rate differences	(63,930		)		(24,108		)	3,967
	Foreign withholding and other foreign taxes	91,882				(100,331		)	(5,861		)
	Foreign tax credits and other, net	(44,032		)		13,153			5,531
	Change in Mexico permanent reinvestment assertion	—				81,853			—
		$	459,244			$	158,116		$	(70,807	)
	At December 31, 2014 and 2013, the significant components of the Company’s deferred tax assets and liabilities are below:
		Year ended December 31,
	In thousands	2014				2013
	Deferred tax liabilities:
	Mineral properties	$	—			$	344,152
	Mexican mining royalty tax	7,586				76,386
	Foreign subsidiaries — unremitted earnings	45,249				182,464
	Inventory	1,100				2,746
	Property, plant, and equipment, net	—				33,094
		$	53,935			$	638,842
	Deferred tax assets:
	Net operating loss carryforwards	153,689				130,170
	Mineral properties	70,510				—
	Property, plant, and equipment	46,042				—
	Foreign subsidiaries — future tax credits	—				163,947
	Royalty and other long-term debt	5,863				11,616
	Capital loss carryforwards	35,251				34,930
	Asset retirement obligation	21,586				18,589
	Unrealized foreign currency loss and other	8,213				9,567
	Accrued expenses	14,773				14,756
Tax credit carryforwards	56,322				23,585
	412,249				407,160
Valuation allowance	(409,883		)		(289,378		)
	2,366				117,782
Net deferred tax liabilities	$	51,569			$	521,060
The Company has evaluated the amount of taxable income and periods over which it must be earned to allow for realization of the deferred tax assets. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon this analysis, the Company has recorded valuation allowances as follows:
	Year ended December 31,
In thousands	2014				2013
U.S.	$	305,534			$	236,653
Argentina	21,520				17,005
Canada	2,009				4,453
Bolivia	15,948				—
Mexico	33,189				—
New Zealand	28,710				27,292
Other	2,973				3,975
	$	409,883			$	289,378
A reconciliation of the beginning and ending amount related to unrecognized tax benefits is below (in thousands):
Unrecognized tax benefits at January 1, 2013	$	10,511
Gross increase to current period tax positions	2,231
Gross increase to prior period tax positions	2,761
Reductions in unrecognized tax benefits resulting from a lapse of the applicable statue of limitations	(32		)
Unrecognized tax benefits at December 31, 2013	$	15,471
Gross increase to current period tax positions	1,856
Gross increase to prior period tax positions	524
Reductions in unrecognized tax benefits resulting from a lapse of the applicable statue of limitations	(1,767		)
Unrecognized tax benefits at December 31, 2014	$	16,084
At December 31, 2014, 2013, and 2012, $16.1 million, $14.3 million, and $10.3 million, respectively, of these gross unrecognized benefits would, if recognized, decrease the Company's effective tax rate. The Company is not able to estimate the amount of change in the Company's gross unrecognized tax benefits within the next twelve months.
The Company classifies interest and penalties associated with uncertain tax positions as a component of income tax expense and has recognized interest and penalties of $2.9 million, $4.1 million, and $2.5 million as of 2014, 2013, and 2012, respectively.
The Company files income tax returns in various U.S. federal and state jurisdictions, in all identified foreign jurisdictions and various others. The statute of limitations remains open from 2012 for the US federal jurisdiction and from 2005 for certain other foreign jurisdictions. During 2014, the U.S. Internal Revenue Service concluded its examination of the Company's 2009, 2010, and 2011 tax years.
In the fourth quarter of 2013, the Company made an assertion that earnings are permanently reinvested in its Coeur Mexicana mining operations entity which resulted in an income tax benefit of $81 million. Therefore, at December 31, 2014, no provision has been made for United States federal and state income taxes on the Company's outside tax basis differences in Mexico, which primarily relate to accumulated foreign earnings which have been reinvested and are expected to be reinvested outside the United States indefinitely.
During 2007, the Company incurred an ownership change which generally limits the availability of existing tax attributes, including net operating loss carryforwards to reduce future taxable income. The Company has the following tax attribute carryforwards at December 31, 2014, by jurisdiction (in thousands):
	U.S.			Argentina			Canada		Mexico		New Zealand	Other	Total
Regular net operating losses	245,683			16,588			1,633		49,747		102,535	22,952	439,138
Alternative minimum tax net operating losses	117,362			—			—		—		—	—	117,362
Capital losses	91,019			—			—		—		—	—	91,019
Alternative minimum tax credits	4,142			—			—		—		—	—	4,142
Foreign tax credits	52,181			—			—		—		—	—	52,181
The U.S. net operating losses expire from 2019 through 2034 and the Canada net operating losses will expire from 2029 through 2034. The Mexico net operating losses expire from 2017 to 2024, while the remaining net operating losses from the foreign jurisdictions have an indefinite carryforward period. The U.S. capital losses expire in 2015 while the Canada capital losses generally have an indefinite carryforward period. Alternative minimum tax credits do not expire and foreign tax credits expire if unused beginning in 2019.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
NET INCOME (LOSS) PER SHARE	NET INCOME (LOSS) PER SHARE
	Basic net income (loss) per share is computed by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock.
	For the years ended December 31, 2014, 2013, and 2012, 1,871,681, 1,111,021, and 479,767 shares, respectively, of common stock equivalents related to equity-based awards were not included in the diluted per share calculation as the shares would be antidilutive.
	The 3.25% Convertible Senior Notes were not included in the computation of diluted net income (loss) per share for the years ended December 31, 2014, 2013, and 2012 because there is no excess value upon conversion over the principal amount of the Notes.
		Year ended December 31,
	In thousands except per share amounts	2014			2013			2012
	Net income (loss) available to common stockholders	$	(1,155,884	)	$	(650,563	)	$	48,677
	Weighted average shares:
	Basic	102,441			97,864			89,437
	Effect of stock-based compensation plans	—			—			166
	Diluted	102,441			97,864			89,603
	Income (loss) per share:
	Basic	$	(11.28	)	$	(6.65	)	$	0.54
	Diluted	$	(11.28	)	$	(6.65	)	$	0.54

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS
	The following table presents the components of Fair value adjustments, net:
			Year ended December 31,
	In thousands		2014				2013				2012
	Palmarejo royalty obligation embedded derivative		$	(2,001	)		$	76,200			$	(31,053	)
	Rochester NSR royalty obligation		3,653				416				—
	Silver and gold options		1,058				7,119				4,302
	Foreign exchange contracts		908				(967		)		3,264
	Fair value adjustments, net		$	3,618			$	82,768			$	(23,487	)
	Accounting standards establish a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1), secondary priority to quoted prices in inactive markets or observable inputs (Level 2), and the lowest priority to unobservable inputs (Level 3).
	The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
		Fair Value at December 31, 2014
	In thousands	Total				Level 1				Level 2				Level 3
	Assets:
	Short-term investments	$	138			$	138			$	—			$	—
	Equity securities	5,982				4,603				—				1,379
	Silver and gold options	3,882				—				3,882				—
		$	10,002			$	4,741			$	3,882			$	1,379
	Liabilities:
	Palmarejo royalty obligation embedded derivative	$	21,912			$	—			$	—			$	21,912
	Rochester NSR royalty obligation	15,370				—				—				15,370
	Silver and gold options	1,039				—				1,039				—
	Other derivative instruments, net	805				—				805				—
		$	39,126			$	—			$	1,844			$	37,282
		Fair Value at December 31, 2013
	In thousands	Total				Level 1				Level 2				Level 3
	Assets:
	Equity securities	$	14,521			$	14,521			$	—			$	—
	Silver and gold options	135				—				135				—
		$	14,656			$	14,521			$	135			$	—
	Liabilities:
	Palmarejo royalty obligation embedded derivative	$	40,338			$	—			$	—			$	40,338
	Rochester NSR royalty obligation	21,630				—				—				21,630
	Other derivative instruments, net	1,591				—				1,591				—
		$	63,559			$	—			$	1,591			$	61,968
	The Company’s short-term investments and investments in equity securities are recorded at fair market value in the financial statements based primarily on quoted market prices. Such instruments are classified within Level 1 of the fair value hierarchy. For certain of the equity securities quoted market prices are not available. These securities are valued using pricing models which require the use of observable and unobservable inputs. In 2014, these securities were reclassified from Level 1 to Level 3 in the fair value hierarchy.
	The Company’s silver and gold options and other derivative instruments, net, which relate to concentrate sales contracts and foreign exchange contracts, are valued using pricing models, which require inputs that are derived from observable market data, including contractual terms, forward market prices, yield curves, credit spreads, and other unobservable inputs. The model inputs can generally be verified and do not involve significant management judgment. Such instruments are classified within Level 2 of the fair value hierarchy.
	The estimated fair value of the Palmarejo royalty obligation embedded derivative and Rochester NSR royalty obligation was estimated based on observable market data including contractual terms, forward silver and gold prices, yield curves and credit spreads.  The Company’s current mine plans are a significant unobservable input used in the estimated fair value of the Palmarejo royalty obligation embedded derivative and Rochester NSR royalty obligation. Therefore, the Company has classified the Palmarejo royalty obligation embedded derivative and Rochester NSR royalty obligation as Level 3 financial liabilities. Based on the current mine plans, expected royalty durations of 1.7 years and 3.2 years were used to estimate the fair value of the Palmarejo royalty obligation embedded derivative and Rochester NSR royalty obligation, respectively, at December 31, 2014.
	The following tables present the changes in the fair value of the Company's Level 3 financial liabilities for the years ended December 31, 2014 and 2013:
		Year ended December 31, 2014
	In thousands	Balance at the beginning of the period				Additions				Revaluation				Settlements			Transfers from Level 1		Balance at the
																			end of the
																			period
	Palmarejo royalty obligation embedded derivative	$	40,338			$	—			$	2,001			$	(20,427	)	$	—	$	21,912
	Rochester NSR royalty obligation	21,630				—				(3,653		)		(2,607		)	—		15,370
	Equity securities	—				69				(55		)		—			1,365		1,379
		Year ended December 31, 2013
	In thousands	Balance at the beginning of the period				Additions				Revaluation				Settlements			Transfers from Level 2		Balance at the
																			end of the
																			period
	Palmarejo royalty obligation embedded derivative	$	—			$	—			$	(76,200	)		$	(28,560	)	$	145,098	$	40,338
	Rochester NSR royalty obligation	—				22,046				(416		)		—			—		21,630
	During 2014, Coeur recorded write-downs related to Property, plant, and equipment and Mining properties totaling $1,472.7 million ($1,021.8 million net of tax). The fair values of Property, plant, and equipment and Mining properties were estimated using a discounted cash flow approach. The discounted cash flow model used significant unobservable inputs and is therefore classified within Level 3 for the fair value hierarchy. The following table sets forth the quantitative and qualitative information related to the unobservable inputs used in the calculation of the Company's non-recurring Level 3 fair value measurements:
	Description	Valuation technique	Unobservable input	Range / Weighted Average
	Property, plant, and equipment and Mining properties	Discounted cash flow	Discount rate	8.0% - 10.75%
			Long-term silver price	$19.00
			Long-term gold price	$1,275
	During 2013, Coeur recorded write-downs related to Property, plant, and equipment and Mining properties totaling $773.0 million ($593.2 million net of tax). The fair values of Property, plant, and equipment and Mining properties were estimated using a discounted cash flow approach. The discounted cash flow model used significant unobservable inputs and is therefore classified within Level 3 for the fair value hierarchy. The following table sets forth the quantitative and qualitative information related to the unobservable inputs used in the calculation of the Company's non-recurring Level 3 fair value measurements:
	Description	Valuation technique	Unobservable input	Range / Weighted Average
	Property, plant, and equipment and Mining properties	Discounted cash flow	Discount rate	8.5% - 10.5%
			Long-term silver price	$25.00
			Long-term gold price	$1,450
	The fair value of financial assets and liabilities carried at book value in the financial statements at December 31, 2014 and December 31, 2013 is presented in the following table:
		31-Dec-14
In thousands	Book Value				Fair Value				Level 1				Level 2			Level 3
Liabilities:
3.25% Convertible Senior Notes due 2028	$	5,334			$	4,979			$	—			$	4,979		$	—
7.875% Senior Notes due 2021	437,454				343,305				—				343,305			—
San Bartolomé Line of Credit	14,785				14,785				—				14,785			—
Palmarejo gold production royalty obligation	34,047				38,290				—				—			38,290
	31-Dec-13
In thousands	Book Value				Fair Value				Level 1				Level 2			Level 3
Liabilities:
3.25% Convertible Senior Notes due 2028	$	5,334			$	5,067			$	5,067			$	—		$	—
7.875% Senior Notes due 2021	300,000				307,314				307,314				—			—
Palmarejo gold production royalty obligation	51,193				65,212				—				—			65,212
The fair value at December 31, 2014 and December 31, 2013 of the 3.25% Convertible Senior Notes and 7.875% Senior Notes outstanding were estimated using quoted market prices. The fair value of debt was transferred to Level 2 from Level 1 of the fair value hierarchy in 2014 due to observability of quoted market prices.
The San Bartolomé line of credit was originated by a third party at December 31, 2014 and, as a result, book value is assumed to be fair value.
The fair value of the Palmarejo gold production royalty obligation is estimated based on observable market data including contractual terms, forward silver and gold prices, yield curves, and credit spreads.  The Company’s current mine plan is a significant input used in the estimated fair value of the Palmarejo gold production royalty obligation and is considered company specific and unobservable.  Therefore, the Company has classified the Palmarejo gold production royalty obligation as a Level 3 financial liability. Based on the current mine plan, an expected royalty duration of 1.7 years was used to estimate the fair value of the Palmarejo gold production royalty obligation at December 31, 2014.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS
	Palmarejo Gold Production Royalty
	On January 21, 2009, the Company's subsidiary, Coeur Mexicana S.A. de C.V. ("Coeur Mexicana"), entered into a gold production royalty agreement with a subsidiary of Franco-Nevada Corporation. The royalty covers 50% of the life of mine production from the Palmarejo mine and adjacent properties. The royalty transaction includes a minimum obligation of 4,167 gold ounces per month and terminates when payments of 400,000 gold ounces have been made. At December 31, 2014, a total of 84,915 gold ounces remain outstanding under the original obligation.
	The price volatility associated with the minimum royalty obligation is considered an embedded derivative. The Company is required to recognize the change in fair value of the remaining minimum obligation due to changing gold prices. Unrealized gains are recognized in periods when the gold price has decreased from the previous period and unrealized losses are recognized in periods when the gold price increases. The fair value of the embedded derivative is reflected net of the Company's current credit adjusted risk free rate, which was 11.8% and 5.7% at December 31, 2014 and December 31, 2013, respectively. The fair value of the embedded derivative at December 31, 2014 and December 31, 2013 was a liability of $21.9 million and $40.3 million, respectively. For the years ended December 31, 2014, 2013, and 2012 the fair value adjustments were gains of $18.4 million, $104.8 million, and $14.3 million.
	Payments on the royalty obligation decrease the carrying amount of the minimum obligation and the derivative liability. Each monthly payment is an amount equal to the greater of the minimum of 4,167 ounces of gold or 50% of the actual gold production per month multiplied by the excess of the monthly average market price of gold above $408 per ounce, subject to a 1% annual inflation adjustment. For the years ended December 31, 2014, 2013, and 2012, realized losses on settlement of the liabilities were $20.4 million, $28.6 million, and $45.4 million, respectively. The fair value adjustments and realized losses are included in Fair value adjustments, net.
	Foreign Exchange Contracts
	At December 31, 2014, the Company had no outstanding call and put option contracts, or collars. At December 31, 2013, the Company had MXN foreign exchange forward contracts on $12.0 million in U.S. dollars. These contracts required the Company to exchange U.S. dollars for MXN at a weighted average exchange rate of 12.21 MXN to each U.S. dollar and the fair value of those contracts was a liability of $0.9 million at December 31, 2013. In addition, at December 31, 2013, the Company had outstanding collars on $45.0 million with a weighted-average strike price of 12.60 MXN for the floor and 14.80 MXN for the ceiling. The fair value of these contracts was nil at December 31, 2013.
	For the years ended December 31, 2014, 2013, and 2012, the Company recorded mark-to-market gains of nil, losses of $1.0 million, and gains of $3.3 million, respectively, on MXN forward contracts and collars. These mark-to-market adjustments are reflected in Fair value adjustments, net. For the years ended December 31, 2014, 2013, and 2012, the Company recorded realized losses of $0.9 million, realized gains of $0.6 million, and realized losses of $1.6 million, respectively, in Costs applicable to sales.
	Provisional Gold and Silver Sales
	The Company's sales to third-party smelters, in general, provide for a provisional payment based upon preliminary assays and forward metal prices. The provisionally priced sales contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of concentrates at the forward price at the time of sale. The embedded derivatives do not qualify for hedge accounting and are marked to market through earnings each period until final settlement. Changes in silver and gold prices resulted in provisional pricing mark-to-market losses of $0.1 million, losses of $2.0 million, and gains of $1.7 million in the years ended December 31, 2014, 2013, and 2012, respectively. At December 31, 2014, the Company had outstanding provisionally priced sales of 0.6 million ounces of silver and 29,137 ounces of gold at prices of $16.35 and $1,221, respectively.
	Silver and Gold Options
	At December 31, 2014, the Company has outstanding put spread contracts on 1,250,000 ounces of silver and 24,000 ounces of gold. The weighted average high and low strike prices on the silver put spreads are $18.00 per ounce and $16.00 per ounce, respectively. The weighted average high and low strike prices on the gold put spreads are $1,200 and $1,050, respectively.
	If the market price of silver and gold were to average less than the high strike price but more than the low strike price during the contract period, the Company would receive the difference between the average market price and the high strike price for the contracted volume over the contract period. If the market price of silver and gold were to average less than the low strike price during the contract period, the Company would receive the difference between the average market price and the high strike price for the contracted volume over the contract period, and the Company would be required to pay the difference between the average market price and the low strike price for the contracted volume over the contract period.
	The put spread contracts are generally net cash settled and expire in the first quarter of 2015. At December 31, 2014, the fair market value of the put spreads was a net asset of $2.8 million.
	At December 31, 2013, the Company had outstanding put options allowing it to net settle 25,000 ounces of gold and 1,250,000 ounces of silver at weighted average prices of $1,150 per ounce and $17.00 per ounce, respectively, if the market price of gold or silver were to average less than the strike price during the contract period. At December 31, 2013, the fair market value of these contracts was a net asset of $0.1 million.
	During the years ended December 31, 2014, 2013, and 2012, the Company recorded unrealized gains of $1.5 million, unrealized gains of $8.9 million, and unrealized gains of $8.6 million, respectively, related to outstanding options which was included in Fair value adjustments, net. The Company also recognized realized losses of $0.6 million, nil, and nil, respectively, resulting from expiring and terminated contracts during the years ended December 31, 2014, 2013, and 2012.
	At December 31, 2014, the Company had the following derivative instruments that settle in each of the years indicated:
	In thousands except average prices and notional ounces	2015				2016				Thereafter
	Palmarejo gold production royalty	$	41,981			$	23,779			$	—
	Average gold price in excess of minimum contractual deduction	$	775			$	774			$	—
	Notional ounces	54,171				30,744				—
	Silver concentrate sales contracts	$	10,392			$	—			$	—
	Average silver price	$	16.35			$	—			$	—
	Notional ounces	635,614				—				—
	Gold concentrate sales contracts	$	35,576			$	—			$	—
	Average gold price	$	1,221			$	—			$	—
	Notional ounces	29,137				—				—
	Gold put options purchased	$	14,400			$	—			$	—
	Average gold strike price	$	1,200			$	—			$	—
	Notional ounces	12,000				—				—
	Silver put options purchased	$	11,250			$	—			$	—
	Average silver strike price	$	18			$	—			$	—
	Notional ounces	625,000				—				—
	Gold put options sold	$	(12,600	)		$	—			$	—
	Average gold strike price	$	1,050			$	—			$	—
	Notional ounces	12,000				—				—
	Silver put options sold	$	(10,000	)		$	—			$	—
	Average silver strike price	$	16			$	—			$	—
	Notional ounces	625,000				—				—
	The following summarizes the classification of the fair value of the derivative instruments:
		December 31, 2014
	In thousands	Prepaid expenses and other				Accrued liabilities and other				Current portion of royalty obligation				Non-current portion of royalty obligation
	Palmarejo gold production royalty	$	—			$	—			$	14,405			$	7,507
	Silver and gold options	3,882				1,039
	Concentrate sales contracts	43				848
		$	3,925			$	1,887			$	14,405			$	7,507
		December 31, 2013
		Prepaid expenses and other				Accrued liabilities and other				Current portion of royalty obligation				Non-current portion of royalty obligation
	Foreign exchange contracts	$	38			$	947			$	—			$	—
	Palmarejo gold production royalty	—				—				17,650				22,688
	Silver and gold options	135				—				—				—
	Concentrate sales contracts	11				693				—				—
		$	184			$	1,640			$	17,650			$	22,688
	The following represent mark-to-market gains (losses) on derivative instruments for the years ended December 31, 2014, 2013, and 2012 (in thousands):
				Year ended December 31,
	Financial statement line	Derivative		2014				2013				2012
	Sales of metal	Concentrate sales contracts		$	(123	)		$	(1,995	)		$	1,682
	Costs applicable to sales	Foreign exchange contracts		924				589				(1,621		)
	Fair value adjustments, net	Foreign exchange contracts		(16		)		(985		)		3,264
	Fair value adjustments, net	Palmarejo gold royalty		(2,001		)		76,200				(31,053		)
	Fair value adjustments, net	Silver and gold options		1,058				7,119				4,302
				$	(158	)		$	80,928			$	(23,426	)
	Credit Risk
	The credit risk exposure related to any derivative instrument is limited to the unrealized gains, if any, on outstanding contracts based on current market prices. To reduce counter-party credit exposure, the Company enters into contracts with financial institutions management deems credit worthy and limits credit exposure to each institution. The Company does not anticipate non-performance by any of its counterparties. In addition, to allow for situations where derivative positions may need to be revised, the Company transacts only in markets that management considers highly liquid.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS
	On December 16, 2014, the Company entered into a merger agreement under which it will issue, in exchange for each issued and outstanding share of Paramount Gold and Silver Corp. ("Paramount"), 0.2016 shares of common stock of the Company, subject to closing conditions being satisfied. Immediately prior to completion of the merger, Paramount will spin-off to its existing stockholders a separate, publicly traded company, expected to be named Paramount Nevada Gold Corp. (“SpinCo”), a subsidiary that owns the Sleeper Gold Project and other assets in Nevada. As part of the transaction, subject to satisfaction of closing conditions, Coeur will make a loan to Paramount in the principal amount of $8.5 million and Paramount will contribute all of the proceeds of such loan to SpinCo as an equity contribution, and SpinCo will issue to Coeur, in exchange for a cash payment by Coeur in the amount of $1.5 million, newly issued shares of SpinCo common stock amounting to 4.9% of the outstanding SpinCo common stock after issuance.
	On December 16, 2014, the Company acquired a 0.7% NSR royalty on Paramount's San Miguel project in a separate transaction not conditioned on the successful acquisition of Paramount for $5.3 million.
	On July 2, 2014, the Company acquired a pre-existing 3.0% NSR royalty on the La Preciosa silver-gold project for $12.0 million.
	On May 27, 2014, the Company's subsidiary, Coeur Capital, Inc., entered into an NSR royalty agreement with Northair Silver Corp. (formerly, International Northair Mines, Ltd., "Northair"). Pursuant to the agreement, the Company paid $2.2 million cash on May 27, 2014 for a 1.25% NSR and $1.8 million on September 2, 2014 for an additional 1.25% NSR royalty payable on future production from Northair's La Cigarra silver project located in north central Mexico.
	The Company completed the acquisition of Global Royalty Corporation (“GRC”) on December 13, 2013. The transaction was accounted for as a business combination. Upon completion of the acquisition, the Company holds NSRs on the El Gallo complex in Mexico and the Zaruma mine in Ecuador. The Company incurred $0.3 million of acquisition-related costs in 2013 related to the acquisition of GRC which are included in General and administrative expense in the Consolidated Statement of Comprehensive Income (Loss).
	Total consideration paid and fair value of assets acquired in the GRC acquisition are as follows (in thousands):
	Total purchase price	26,047
	Total liabilities assumed	8,605
	Total consideration	$	34,652
	Total assets acquired	$	34,652
	On April 16, 2013, the Company completed its acquisition of Orko Silver Corporation (“Orko”). As a result of the acquisition, the Company owns the La Preciosa silver-gold project in the state of Durango, Mexico. The transaction was accounted for as a purchase of mineral interests since La Preciosa is an exploration stage project.
	Total consideration paid and fair value of assets acquired in the Orko acquisition are as follows (in thousands):
	Total purchase price	295,841
	Total liabilities assumed	116,955
	Total consideration	$	412,796
	Total assets acquired	$	412,796

Investments

Investments	12 Months Ended
	Dec. 31, 2014
Investment in Marketable Securities [Abstract]
INVESTMENTS	INVESTMENTS
	The Company invests part of its cash balances in a managed portfolio of liquid investments, including highly-rated corporate bonds, classified as short-term investments. The Company also invests in equity securities of silver and gold exploration and development companies. These investments are classified as available-for-sale and are measured at fair value in the financial statements with unrealized gains and losses recorded in Other comprehensive income (loss).
		At December 31, 2014
	In thousands	Cost				Gross				Gross				Estimated
						Unrealized				Unrealized				Fair Value
						Losses				Gains
	Equity securities	$	5,687			$	(8	)		$	303			$	5,982
		At December 31, 2013
	In thousands	Cost				Gross				Gross				Estimated
						Unrealized				Unrealized				Fair Value
						Losses				Gains
	Equity securities	$	17,649			$	(3,300	)		$	172			$	14,521
	The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2014:
		Less than twelve months							Twelve months or more							Total
	In thousands	Unrealized Losses			Fair Value				Unrealized Losses			Fair Value				Unrealized Losses			Fair Value
	Equity securities	$	(8	)	$	38			$	—		$	—			$	(8	)	$	38
	During 2014, the Company sold $49.1 million of short-term investments and $5.2 million of equity securities which resulted in the recognition of a realized loss of $0.6 million. The Company recognized net of tax unrealized losses of $2.3 million, $8.5 million, and $3.4 million in the years ended December 31, 2014, 2013, and 2012, respectively, in Other comprehensive income (loss). The Company performs a quarterly assessment on each of its equity securities with unrealized losses to determine if the security is other than temporarily impaired. The Company recorded other-than-temporary impairment losses of $6.6 million, $18.3 million and $0.6 million in the years ended December 31, 2014, 2013, and 2012, respectively.

Receivables

Receivables	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
RECEIVABLES	RECEIVABLES
	Receivables consist of the following:
	In thousands	December 31, 2014		December 31, 2013
	Current receivables:
	Trade receivables	$	20,448	$	17,303
	Income tax receivable	30,045		8,363
	Value added tax receivable	63,805		49,168
	Other	2,623		6,240
		$	116,921	$	81,074
	Non-current receivables:
	Value added tax receivable	$	21,686	$	36,574
	Total Receivables	$	138,607	$	117,648

Inventory_and_Ore_on_Leach_Pad

Inventory and Ore on Leach Pads	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
INVENTORY AND ORE ON LEACH PADS	INVENTORY AND ORE ON LEACH PADS
	Inventory consists of the following:
	In thousands	December 31, 2014		December 31, 2013
	Inventory:
	Concentrate	$	23,563	$	14,855
	Precious metals	40,870		52,250
	Supplies	50,498		64,918
		$	114,931	$	132,023
	Ore on Leach Pads:
	Current	$	48,204	$	50,495
	Non-Current	37,889		31,528
		$	86,093	$	82,023
	Total Inventory and Ore on Leach Pads	$	201,024	$	214,046

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT
	Property, plant, and equipment consist of the following:
	In thousands	December 31, 2014			December 31, 2013
	Land	$	1,752		$	1,764
	Facilities and equipment	647,181			855,318
	Capital leases	28,680			16,133
		677,613			873,215
	Accumulated amortization	(464,852		)	(395,520		)
		212,761			477,695
	Construction in progress	15,150			8,578
	Property, plant, and equipment, net	$	227,911		$	486,273
	Rent expense for operating lease agreements was $11.2 million, $16.7 million and $14.1 million for the years ended December 31, 2014, 2013, and 2012, respectively.

Mining_Properties

Mining Properties	12 Months Ended
	Dec. 31, 2014
Mining Properties [Abstract]
MINING PROPERTIES	MINING PROPERTIES
	Mining properties consist of the following (in thousands):
	December 31, 2014	Palmarejo			San			Kensington			Rochester			La Preciosa		Joaquin		Coeur Capital			Total
					Bartolomé
	Mine development	$	137,821		$	49,305		$	217,138		$	153,535		$	—	$	—	$	—		$	557,799
	Accumulated amortization	(121,906		)	(26,106		)	(106,865		)	(113,533		)	—		—		—			(368,410		)
		15,915			23,199			110,273			40,002			—		—		—			189,389
	Mineral interests	521,349			17,560			—			—			49,059		10,000		81,461			679,429
	Accumulated amortization	(332,032		)	(10,143		)	—			—			—		—		(25,451		)	(367,626		)
		189,317			7,417			—			—			49,059		10,000		56,010			311,803
	Mining properties, net	$	205,232		$	30,616		$	110,273		$	40,002		$	49,059	$	10,000	$	56,010		$	501,192
	December 31, 2013	Palmarejo			San			Kensington			Rochester			La Preciosa		Joaquin		Coeur Capital			Total
					Bartolomé
	Mine development	$	151,845		$	70,761		$	268,351		$	150,348		$	—	$	—	$	—		$	641,305
	Accumulated amortization	(110,143		)	(22,236		)	(80,032		)	(103,130		)	—		—		—			(315,541		)
		41,702			48,525			188,319			47,218			—		—		—			325,764
	Mineral interests	1,146,572			26,643			—			—			408,352		93,429		78,133			1,753,129
	Accumulated amortization	(300,187		)	(8,759		)	—			—			—		—		(18,446		)	(327,392		)
		846,385			17,884			—			—			408,352		93,429		59,687			1,425,737
	Mining properties, net	$	888,087		$	66,409		$	188,319		$	47,218		$	408,352	$	93,429	$	59,687		$	1,751,501
	The Palmarejo mine is an underground and open pit silver and gold mine located in the State of Chihuahua in northern Mexico, and the company controls a large portion of the properties surrounding the mine. The Palmarejo mine commenced production in April 2009.
	The San Bartolomé mine is a silver mine located near the city of Potosi, Bolivia. The mineral rights for the San Bartolomé project are held through long-term joint venture/lease agreements with several local independent mining co-operatives and the Bolivian state owned mining organization, (“COMIBOL”). The Company commenced commercial production at San Bartolomé in June 2008.
	The Kensington mine is an underground gold mine and consists of the Kensington and adjacent Jualin properties located north-northwest of Juneau, Alaska. The Company commenced commercial production in July 2010.
	The Company has conducted operations at the Rochester silver and gold mine, located in northwestern Nevada, since September 1986. The mine utilizes the heap-leaching process to extract both silver and gold from ore mined using open pit methods.
	The La Preciosa silver and gold project is located in the State of Durango in northern Mexico. The Company completed a feasibility study in 2014 and has deferred construction activities until expected returns improve.
	The Joaquin silver and gold project is located in the Santa Cruz province of southern Argentina. The Company commenced exploration of the property located north of the Company's Martha silver mine in November 2007.
	The Company's mineral interests held by Coeur Capital primarily consist of the Endeavor silver stream acquired by the Company in May 2005 and amended in March 2006, under which the Company owns all silver production and reserves up to a total of 20.0 million payable ounces at the Endeavor mine in Australia, which is owned and operated by Cobar Operations Pty. Limited, a wholly-owned subsidiary of CBH Resources Ltd. The Company has received 5.4 million payable ounces to-date and the current ore reserve contains 1.7 million payable ounces.
	Coeur Capital also holds royalties on McEwen Mining Inc.’s El Gallo/Magistral mine in Mexico, currently paying a 3.5% NSR royalty, a 1.5% NSR royalty on Dynasty Metals & Mining, Inc.’s Zaruma mine in Ecuador, a 2.0% NSR royalty on Mandalay Resources Corp.’s Cerro Bayo mine in Chile, and royalties on other non-producing properties. Another Coeur subsidiary owns an 80% interest in a 2.5% royalty on Newmont Mining Corporation's Correnso mine in New Zealand. Royalty revenue is immaterial to the Company.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
DEBT	DEBT
	Long-term debt and capital lease obligations at December 31, 2014 and December 31, 2013 are as follows:
		December 31, 2014						December 31, 2013
	In thousands	Current			Non-Current			Current			Non-Current
	3.25% Convertible Senior Notes due 2028	$	5,334		$	—		$	—		$	5,334
	7.875% Senior Notes due 2021	—			437,454			—			300,000
	San Bartolomé Letter of Credit	4,481			10,304			—			—
	Capital lease obligations	7,683			13,141			2,505			796
		$	17,498		$	460,899		$	2,505		$	306,130
	Minimum future lease payments under capital and operating leases with terms longer than one year are $12.8 million in 2015, $12.0 million in 2016, $6.1 million in 2017, $4.6 million in 2018, $4.7 million in 2019, and $6.0 million thereafter.
	7.875% Senior Notes due 2021
	During the year ended December 31, 2014, the Company repurchased $15.1 million in aggregate principal amount of its 7.875% Senior Notes due 2021 (the "Senior Notes"), resulting in a balance of $437.5 million at December 31, 2014.
	On March 12, 2014, the Company completed a follow-on offering of $150 million in aggregate principal amount of its Senior Notes (the “Additional Notes”) in a private placement conducted pursuant to Rule 144A and Regulation S under the Securities Act of 1933, as amended (the “Securities Act”). The Additional Notes constitute a further issuance of the Original Notes (as defined below) and form a single series of debt securities with the Original Notes. Upon completion of Coeur’s offering of the Additional Notes, the aggregate principal amount of the outstanding Senior Notes was $450 million. The Company commenced an exchange offer for the Additional Notes on April 10, 2014 to exchange the Additional Notes for freely transferable notes containing substantially similar terms, in accordance with the registration rights granted to the holders of the Additional Notes when they were issued. The exchange offer was consummated on May 9, 2014.
	On January 29, 2013, the Company completed an offering of $300 million in aggregate principal amount of 7.875% Senior Notes due 2021 (the “Original Notes”) in a private placement conducted pursuant to the Securities Act. The Company commenced an exchange offer for the Original Notes on September 30, 2013 to exchange the Original Notes for freely transferable notes containing substantially similar terms, in accordance with the registration rights granted to the holders of the Original Notes when they were issued. The exchange offer was consummated on November 5, 2013.
	3.25% Convertible Senior Notes due 2028
	Per the indenture governing the 3.25% Convertible Senior Notes due 2028 (the “Convertible Notes”), the Company announced on February 13, 2013 that it was offering to repurchase all of the Convertible Notes. As of February 12, 2013, there was $48.7 million aggregate principal amount of Convertible Notes outstanding. The Company repurchased $43.3 million in aggregate principal amount, leaving a balance of $5.3 million at December 31, 2014. The Convertible Notes are classified as current liabilities at December 31, 2014 as a result of the holders' option to require the Company to repurchase the notes on March 15, 2015.
	Revolving Credit Facility
	On August 1, 2012, Coeur Alaska, Inc. and Coeur Rochester, Inc. (the “Borrowers”), each a wholly-owned subsidiary of the Company, entered into a Credit Agreement (as subsequently amended on January 16, 2014, the “Credit Agreement”) by and among the Company, the Borrowers, the lenders party thereto and Wells Fargo Bank, N.A., as administrative agent. The Credit Agreement provided for a senior secured revolving credit facility (the “Revolving Credit Facility”) in an aggregate principal amount of up to $100.0 million, which principal amount may be increased, subject to receiving additional commitments therefor, by up to $50.0 million.
	On March 20, 2014, the Borrowers notified the administrative agent that they were terminating the Revolving Credit Facility, effective March 25, 2014. The Company wrote off $3.0 million related to the termination of the Credit Agreement in the year ended December 31, 2014. No amounts were outstanding under the Revolving Credit Facility at the time of termination, and no early termination penalty was payable in connection with the termination.
	Lines of Credit
	At December 31, 2014, San Bartolomé had two outstanding lines of credit. The first line of credit is for $12.0 million bearing interest at 6.0% per annum, maturing in 360 days. The second line of credit is for $15.0 million bearing interest at 6.0%, maturing in three years. Both lines of credit are secured with machinery and equipment. There is an aggregate outstanding balance of $14.8 million on both lines of credit at December 31, 2014.
	Palmarejo Gold Production Royalty Obligation
	On January 21, 2009, Coeur Mexicana entered into a gold production royalty transaction with a subsidiary of Franco-Nevada Corporation under which the subsidiary of Franco-Nevada Corporation purchased a royalty covering 50% of the life of mine gold to be produced from its Palmarejo silver and gold mine in Mexico.
	The royalty agreement provides for a minimum obligation to be paid monthly on a total of 400,000 ounces of gold, or 4,167 ounces per month over an initial eight year period. Each monthly payment is an amount equal to the greater of 4,167 ounces of gold or 50% of actual gold production multiplied by the excess of the monthly average market price of gold above $408 per ounce, subject to a 1% annual inflation compounding adjustment. Payments under the royalty agreement are made in cash or gold bullion. During the years ended December 31, 2014, 2013, and 2012, the Company paid $48.4 million, $57.0 million, and $74.7 million, respectively. At December 31, 2014, payments had been made on a total of 315,085 ounces of gold with further payments to be made on an additional 84,915 ounces of gold.
	The Company used an implicit interest rate of 30.5% to discount the original royalty obligation, based on the fair value of the consideration received projected over the expected future cash flows at inception of the obligation. The discounted obligation is accreted to its expected future value over the expected minimum payment period based on the implicit interest rate. The Company recognized accretion expense for the years ended December 31, 2014, 2013, and 2012 of $10.8 million, $17.6 million, and $19.1 million, respectively. At December 31, 2014 and December 31, 2013, the remaining minimum obligation under the royalty agreement was $34.0 million and $51.2 million, respectively.
	Interest Expense
	Interest expense consists of the following:
		Year ended December 31,
	In thousands	2014			2013			2012
	3.25% Convertible Senior Notes due 2028	$	173		$	466		$	1,581
	7.875% Senior Notes due 2021	32,741			21,853			—
	Revolving Credit Facility	179			612			213
	Loss on Revolving Credit Facility	3,035			—			2,339
	Capital lease obligations	972			415			997
	Other debt obligations	—			291			881
	Accretion of Palmarejo gold production royalty obligation	10,773			17,641			19,139
	Amortization of debt issuance costs	1,740			2,143			1,146
	Accretion of debt (premium) discount	(357		)	576			2,536
	Capitalized interest	(1,710		)	(2,694		)	(2,663		)
	Total interest expense, net of capitalized interest	$	47,546		$	41,303		$	26,169

Supplemental_Guarantor_Informa

Supplemental Guarantor Information	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	SUPPLEMENTAL GUARANTOR INFORMATION
	The following Condensed Consolidating Financial Statements are presented to satisfy disclosure requirements of Rule 3-10 of Regulation S-X resulting from the guarantees by Coeur Alaska, Inc., Coeur Explorations, Inc., Coeur Rochester, Inc., Coeur South America Corp., and Coeur Capital, Inc. (collectively, the “Subsidiary Guarantors”) of the $434.9 million aggregate principal amount of Senior Notes. The following schedules present Condensed Consolidating Financial Statements of (a) Coeur, the parent company; (b) the Subsidiary Guarantors; and (c) certain wholly owned domestic and foreign subsidiaries of the Company (collectively, the “Non-Guarantor Subsidiaries”). Each of the Subsidiary Guarantors is 100% owned by Coeur and the guarantees are full and unconditional. There are no restrictions on the ability of Coeur to obtain funds from its subsidiaries by dividend or loan.
	CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)
	YEAR ENDED DECEMBER 31, 2014
	In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Revenue	$	—		$	261,963		$	373,779		$	—		$	635,742
	COSTS AND EXPENSES
	Costs applicable to sales(1)	—			196,805			281,140			—			477,945
	Amortization	1,805			65,100			95,531			—			162,436
	General and administrative	39,976			6			863			—			40,845
	Exploration	3,560			11,157			7,023			—			21,740
	Write-downs	—			107,832			1,364,889			—			1,472,721
	Pre-development, reclamation, and other	8,813			3,889			13,335			—			26,037
	Total costs and expenses	54,154			384,789			1,762,781			—			2,201,724
	OTHER INCOME (EXPENSE), NET
	Fair value adjustments, net	1,812			3,653			(1,847		)	—			3,618
	Impairment of equity securities	—			(6,593		)	—			—			(6,593		)
	Interest income and other, net	4,406			(430		)	227			(2,828		)	1,375
	Interest expense, net of capitalized interest	(38,389		)	(891		)	(11,094		)	2,828			(47,546		)
	Total other income (expense), net	(32,171		)	(4,261		)	(12,714		)	—			(49,146		)
	Income (Loss) before income and mining taxes	(86,325		)	(127,087		)	(1,401,716		)	—			(1,615,128		)
	Income and mining tax (expense) benefit	1,742			(2,224		)	459,726			—			459,244
	Income (Loss) after income and mining taxes	(84,583		)	(129,311		)	(941,990		)	—			(1,155,884		)
	Equity income (loss) in consolidated subsidiaries	(1,071,301		)	(4,181		)	—			1,075,482			—
	NET INCOME (LOSS)	$	(1,155,884	)	$	(133,492	)	$	(941,990	)	$	1,075,482		$	(1,155,884	)
	OTHER COMPREHENSIVE INCOME (LOSS), net of tax:
	Unrealized gain (loss) on equity securities, net of tax	(2,290		)	(2,272		)	—			2,272			(2,290		)
	Reclassification adjustments for impairment of equity securities, net of tax	4,042			4,042			—			(4,042		)	4,042
	Reclassification adjustments for realized loss on sale of equity securities, net of tax	346			328			—			(328		)	346
	Other comprehensive income (loss)	2,098			2,098			—			(2,098		)	2,098
	COMPREHENSIVE INCOME (LOSS)	$	(1,153,786	)	$	(131,394	)	$	(941,990	)	$	1,073,384		$	(1,153,786	)
	(1) Excludes amortization.
	CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)
	YEAR ENDED DECEMBER 31, 2013
	In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Revenue	$	—		$	268,023		$	477,971		$	—		$	745,994
	COSTS AND EXPENSES
	Costs applicable to sales(1)	—			182,444			281,219			—			463,663
	Amortization	1,066			71,655			156,843			—			229,564
	General and administrative	50,213			3,245			1,885			—			55,343
	Exploration	1,602			8,920			11,838			—			22,360
	Litigation settlement	—			32,046			—			—			32,046
	Write-downs	—			130,694			642,299			—			772,993
	Pre-development, reclamation, and other	—			3,093			12,091			—			15,184
	Total costs and expenses	52,881			432,097			1,106,175			—			1,591,153
	OTHER INCOME (EXPENSE), NET
	Fair value adjustments, net	(1,346		)	7,896			76,218			—			82,768
	Impairment of equity securities	(18,097		)	(211		)	—			—			(18,308		)
	Interest income and other, net	13,408			(1,539		)	4,602			(3,148		)	13,323
	Interest expense, net of capitalized interest	(25,652		)	(445		)	(18,354		)	3,148			(41,303		)
	Total other income (expense), net	(31,687		)	5,701			62,466			—			36,480
	Income (Loss) before income and mining taxes	(84,568		)	(158,373		)	(565,738		)	—			(808,679		)
	Income and mining tax (expense) benefit	78,332			(155		)	79,939			—			158,116
	Income (Loss) after income and mining taxes	(6,236		)	(158,528		)	(485,799		)	—			(650,563		)
	Equity income (loss) in consolidated subsidiaries	(644,327		)	(68		)	—			644,395			—
	NET INCOME (LOSS)	$	(650,563	)	$	(158,596	)	$	(485,799	)	$	644,395		$	(650,563	)
	OTHER COMPREHENSIVE INCOME (LOSS), net of tax:
	Unrealized gain (loss) on equity securities, net of tax	(8,489		)	(552		)	—			552			(8,489		)
	Reclassification adjustments for impairment of equity securities, net of tax	11,221			211			—			(211		)	11,221
	Reclassification adjustments for realized loss on sale of equity securities, net of tax	83			—			—			—			83
	Other comprehensive income (loss)	2,815			(341		)	—			341			2,815
	COMPREHENSIVE INCOME (LOSS)	$	(647,748	)	$	(158,937	)	$	(485,799	)	$	644,736		$	(647,748	)
	(1) Excludes amortization.
	CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)
YEAR ENDED DECEMBER 31, 2012
In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	—		$	243,380		$	652,112		$	—		$	895,492
COSTS AND EXPENSES
Costs applicable to sales(1)	—			159,151			295,411			—			454,562
Amortization	521			48,065			167,446			—			216,032
General and administrative	30,699			1,101			1,177			—			32,977
Exploration	1,946			7,930			16,394			—			26,270
Write-downs	—			—			5,825			—			5,825
Pre-development, reclamation, and other	—			1,323			2,763			—			4,086
Total costs and expenses	33,166			217,570			489,016			—			739,752
Loss on debt extinguishments	—			(1,036		)	—			—			(1,036		)
Fair value adjustments, net	3,477			4,089			(31,053		)	—			(23,487		)
Impairment of equity securities	(605		)	—			—			—			(605		)
Interest income and other, net	5,744			859			13,071			(4,633		)	15,041
Interest expense, net of capitalized interest	(4,158		)	(2,997		)	(23,647		)	4,633			(26,169		)
Total other income (expense), net	4,458			915			(41,629		)	—			(36,256		)
Income (Loss) before income and mining taxes	(28,708		)	26,725			121,467			—			119,484
Income and mining tax (expense) benefit	(3,844		)	(2,930		)	(64,033		)	—			(70,807		)
Income (Loss) after income and mining taxes	(32,552		)	23,795			57,434			—			48,677
Equity income (loss) in consolidated subsidiaries	81,229			—			—			(81,229		)	—
NET INCOME (LOSS)	$	48,677		$	23,795		$	57,434		$	(81,229	)	$	48,677
OTHER COMPREHENSIVE INCOME (LOSS), net of tax:
Unrealized gain (loss) on equity securities, net of tax	(3,351		)	—			—			—			(3,351		)
Reclassification adjustments for impairment of equity securities, net of tax	605			—			—			—			605
Other comprehensive income (loss)	(2,746		)	—			—			—			(2,746		)
COMPREHENSIVE INCOME (LOSS)	$	45,931		$	23,795		$	57,434		$	(81,229	)	$	45,931
(1) Excludes amortization.
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
YEAR ENDED DECEMBER 31, 2014
In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	$	(1,144,474	)	$	41,292		$	80,627		$	1,075,482		52,927
CASH FLOWS FROM INVESTING ACTIVITIES	—			—			—
Capital expenditures	(1,849		)	(28,118		)	(34,277		)	—			(64,244		)
Purchase of short term investments and equity securities	(50,013		)	(429		)	(71		)	—			(50,513		)
Sales and maturities of short term investments and equity securities	49,069			5,261			14			—			54,344
Acquisitions	(12,079		)	(4,000		)	(5,250		)	—			(21,329		)
Other	—			48			(40		)	—			8
Investments in consolidated subsidiaries	1,120,382			4,106			—			(1,124,488		)	—
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,105,510			(23,132		)	(39,624		)	(1,124,488		)	(81,734		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of notes and bank borrowings	153,000			—			14,784			—			167,784
Payments on long-term debt, capital leases, and associated costs	(18,545		)	(6,114		)	(1,243		)	—			(25,902		)
Gold production royalty payments	—			—			(48,395		)	—			(48,395		)
Net intercompany financing activity	(21,697		)	(7,256		)	(20,053		)	49,006			—
Other	(509		)	—			—			—			(509		)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	112,249			(13,370		)	(54,907		)	49,006			92,978
NET CHANGE IN CASH AND CASH EQUIVALENTS	73,285			4,790			(13,904		)	—			64,171
Cash and cash equivalents at beginning of period	137,076			991			68,623			—			206,690
Cash and cash equivalents at end of period	$	210,361		$	5,781		$	54,719		$	—		$	270,861
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
YEAR ENDED DECEMBER 31, 2013
In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	$	(701,653	)	$	17,456		$	151,491		$	646,173		$	113,467
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,573		)	(50,810		)	(46,430		)	—			(100,813		)
Purchase of short term investments and equity securities	(2,921		)	(66		)	(5,065		)	—			(8,052		)
Sales and maturities of short term investments and equity securities	29,274			75			5,447			—			34,796
Acquisitions	(113,214		)	(3,684		)	—			—			(116,898		)
Other	3,266			444			768			—			4,478
Investments in consolidated subsidiaries	642,617			68			3,488			(646,173		)	—
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	555,449			(53,973		)	(41,792		)	(646,173		)	(186,489		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of notes and bank borrowings	300,000			—			—			—			300,000
Payments on long-term debt, capital leases, and associated costs	(52,568		)	(3,171		)	(4,889		)	—			(60,628		)
Gold production royalty payments	—			—			(57,034		)	—			(57,034		)
Share repurchases	(27,552		)	—			—			—			(27,552		)
Net intercompany financing activity	(22,874		)	40,279			(17,405		)	—			—
Other	(514		)	—			—			—			(514		)
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	196,492			37,108			(79,328		)	—			154,272
NET CHANGE IN CASH AND CASH EQUIVALENTS	50,288			591			30,371			—			81,250
Cash and cash equivalents at beginning of period	86,788			400			38,252			—			125,440
Cash and cash equivalents at end of period	$	137,076		$	991		$	68,623		$	—		$	206,690
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
YEAR ENDED DECEMBER 31, 2012
In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	$	58,754		$	37,426		$	256,683		$	(81,229	)	271,634
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,531		)	(48,788		)	(65,322		)	—			(115,641		)
Purchase of short term investments and equity securities	(12,913		)	(46		)	—			—			(12,959		)
Sales and maturities of short term investments and equity securities	21,590			45			60			—			21,695
Acquisitions	(29,338		)	—			41			—			(29,297		)
Other	3,538			130			(581		)	—			3,087
Investments in consolidated subsidiaries	(81,229		)	—			—			81,229			—
CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(99,883		)	(48,659		)	(65,802		)	81,229			(133,115		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on long-term debt, capital leases, and associated costs	(4,005		)	(79,839		)	(13,326		)	—			(97,170		)
Gold production royalty payments	—			—			(74,734		)	—			(74,734		)
Share repurchases	(19,971		)	—			—			—			(19,971		)
Net intercompany financing activity	67,082			86,394			(153,476		)	—			—
Other	(861		)	4,645			—			—			3,784
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	42,245			11,200			(241,536		)	—			(188,091		)
NET CHANGE IN CASH AND CASH EQUIVALENTS	1,116			(33		)	(50,655		)	—			(49,572		)
Cash and cash equivalents at beginning of period	85,672			433			88,907			—			175,012
Cash and cash equivalents at end of period	$	86,788		$	400		$	38,252		$	—		$	125,440
CONDENSED CONSOLIDATING BALANCE SHEET
DECEMBER 31, 2014
In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	210,361		$	5,781		$	54,719		$	—		$	270,861
Receivables	87			11,151			105,683			—			116,921
Ore on leach pads	—			48,204			—			—			48,204
Inventory	—			54,983			59,948			—			114,931
Deferred tax assets	393			—			6,971			—			7,364
Prepaid expenses and other	6,349			4,557			4,617			—			15,523
	217,190			124,676			231,938			—			573,804
NON-CURRENT ASSETS
Property, plant, and equipment, net	6,155			107,084			114,672			—			227,911
Mining properties, net	12,004			159,124			330,064			—			501,192
Ore on leach pads	—			37,889			—			—			37,889
Restricted assets	897			50			6,090			—			7,037
Equity securities	—			5,982			—			—			5,982
Receivables	—			—			21,686			—			21,686
Debt issuance costs, net	9,851			—			—			—			9,851
Deferred tax assets	30,419			—			29,732			—			60,151
Net investment in subsidiaries	128,913			45,615			—			(174,528		)	—
Other	50,813			5,522			4,394			(50,814		)	9,915
TOTAL ASSETS	$	456,242		$	485,942		$	738,576		$	(225,342	)	$	1,455,418
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Accounts payable	$	3,414		$	13,391		$	32,247		$	—		$	49,052
Accrued liabilities and other	22,588			11,207			17,718			—			51,513
Debt	5,334			7,476			4,688			—			17,498
Royalty obligations	—			5,747			37,931			—			43,678
Reclamation	—			3,401			1,621			(1,151		)	3,871
Deferred tax liabilities	7,142			848			88			—			8,078
	38,478			42,070			94,293			(1,151		)	173,690
NON-CURRENT LIABILITIES
Debt	437,455			12,806			61,452			(50,814		)	460,899
Royalty obligations	—			9,623			18,028			—			27,651
Reclamation	—			46,792			19,000			1,151			66,943
Deferred tax liabilities	53,201			2,963			54,842			—			111,006
Other long-term liabilities	2,582			469			26,860			—			29,911
Intercompany payable (receivable)	(660,792		)	427,156			233,636			—			—
	(167,554		)	499,809			413,818			(49,663		)	696,410
STOCKHOLDERS’ EQUITY
Common stock	1,034			250			128,299			(128,549		)	1,034
Additional paid-in capital	2,789,695			79,712			1,682,830			(1,762,542		)	2,789,695
Accumulated deficit	(2,202,603		)	(133,091		)	(1,580,664		)	1,713,755			(2,202,603		)
Accumulated other comprehensive income (loss)	(2,808		)	(2,808		)	—			2,808			(2,808		)
	585,318			(55,937		)	230,465			(174,528		)	585,318
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	456,242		$	485,942		$	738,576		$	(225,342	)	$	1,455,418
CONDENSED CONSOLIDATING BALANCE SHEET
DECEMBER 31, 2013
In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	137,076		$	991		$	68,623		$	—		$	206,690
Receivables	530			19,982			60,562			—			81,074
Ore on leach pads	—			50,495			—			—			50,495
Inventory	—			35,290			96,733			—			132,023
Deferred tax assets	—			—			35,008			—			35,008
Prepaid expenses and other	4,128			5,282			16,530			—			25,940
	141,734			112,040			277,456			—			531,230
NON-CURRENT ASSETS
Property, plant, and equipment, net	5,980			143,118			337,175			—			486,273
Mining properties, net	—			235,537			1,515,964			—			1,751,501
Ore on leach pads	—			31,528			—			—			31,528
Restricted assets	830			50			6,134			—			7,014
Equity securities	—			14,521			—			—			14,521
Receivables	—			—			36,574			—			36,574
Debt issuance costs, net	10,812			—			—			—			10,812
Deferred tax assets	955			—			234			—			1,189
Net investment in subsidiaries	1,242,480			46,215			1,578,799			(2,867,494		)	—
Other	53,858			14,616			320,425			(373,563		)	15,336
TOTAL ASSETS	$	1,456,649		$	597,625		$	4,072,761		$	(3,241,057	)	$	2,885,978
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Accounts payable	$	1,963		$	15,864		$	36,020		$	—		$	53,847
Accrued liabilities and other	16,693			8,016			14,611			(1,054		)	38,266
Debt	—			1,262			309,472			(308,229		)	2,505
Royalty obligations	—			3,934			44,085			—			48,019
Reclamation	—			—			794			119			913
Deferred tax liabilities	—			—			1,011			—			1,011
	18,656			29,076			405,993			(309,164		)	144,561
NON-CURRENT LIABILITIES
Debt	305,335			255			64,820			(64,280		)	306,130
Royalty obligations	—			17,696			47,446			—			65,142
Reclamation	—			45,894			11,740			(119		)	57,515
Deferred tax liabilities	37,095			1,618			517,533			—			556,246
Other long-term liabilities	2,467			544			22,806			—			25,817
Intercompany payable (receivable)	(637,471		)	427,085			210,386			—			—
	(292,574		)	493,092			874,731			(64,399		)	1,010,850
STOCKHOLDERS’ EQUITY
Common stock	1,028			250			122,666			(122,916		)	1,028
Additional paid-in capital	2,781,164			79,712			3,258,037			(3,337,749		)	2,781,164
Accumulated deficit	(1,046,719		)	401			(588,666		)	588,265			(1,046,719		)
Accumulated other comprehensive income (loss)	(4,906		)	(4,906		)	—			4,906			(4,906		)
	1,730,567			75,457			2,792,037			(2,867,494		)	1,730,567
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	1,456,649		$	597,625		$	4,072,761		$	(3,241,057	)	$	2,885,978

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES
	Labor Union Contracts
	The Company maintains a labor agreement with Sindicato de Trabajadores Mineros de la Empresa Manquiri S.A. at the San Bartolomé mine in Bolivia. The San Bartolomé mine labor agreement, which became effective January 28, 2010, is currently active and does not have a fixed term. At December 31, 2014, approximately 12% of the Company’s global labor force was covered by this collective bargaining agreement. The Company cannot predict whether this agreement will be renewed on similar terms or at all, whether future labor disruptions will occur or, if disruptions do occur, how long they will last.
	Rochester Production Royalties
	The Company acquired the Rochester property from ASARCO, a subsidiary of Grupo Mexico S.A. de C.V., in 1983. The Company is obligated to pay a NSR royalty interest to ASARCO when the market price of silver equals or exceeds $23.60 per ounce up to a maximum rate of 5% with the condition that Rochester achieves positive cash flow for the applicable year. If cash flow at Rochester is negative in any calendar year, the maximum royalty payable is $250,000.
	Commencing January 1, 2014, Coeur Rochester is obligated to pay a 3.4% NSR royalty on up to 39.4 million silver equivalent ounces produced and sold from a portion of the Rochester mine, payable on a quarterly basis. For each calendar quarter, the royalty will be payable on the actual sales prices received (exclusive of gains or losses associated with trading activities), less refining costs, of gold and silver produced and sold from the applicable portions of the Rochester mine. Changes in the Company's mine plan and silver and gold prices result in the recognition of mark-to-market gains or losses in Fair value adjustments, net. At December 31, 2014, payments had been made on 4.0 million silver equivalent ounces with further payments to be made on 35.5 million silver equivalent ounces.
	Palmarejo Gold Production Royalty
	On January 21, 2009, Coeur Mexicana entered into a gold production royalty agreement with a subsidiary of Franco-Nevada Corporation under which the subsidiary of Franco-Nevada Corporation purchased a royalty covering 50% of the life of mine gold to be produced from its Palmarejo silver and gold mine in Mexico. The royalty agreement provides for a minimum obligation to be paid monthly on a total of 400,000 ounces of gold, or 4,167 ounces per month over an initial eight-year period. Please see Note 11 -- Derivative Financial Instruments for further discussion on the royalty obligation.
	On October 2, 2014, Coeur Mexicana terminated the Palmarejo gold production royalty in exchange for a termination payment of $2.0 million, effective upon completion of the minimum ounce delivery requirement. Subsequently, Coeur Mexicana entered into a gold stream agreement with a subsidiary of Franco-Nevada Corporation whereby Coeur Mexicana will sell 50% of Palmarejo gold production upon completion of the gold production royalty minimum ounce delivery requirement for the lesser of $800 or spot price per ounce.  Under the gold stream agreement, Coeur Mexicana will receive an aggregate $22.0 million deposit toward future deliveries under the gold stream agreement, payable in five quarterly payments beginning in the first quarter 2015.
	Sites Related to Callahan Mining Corporation
	In 1991, the Company acquired all of the outstanding common stock of Callahan Mining Corporation. The Company has received requests for information or notices of potential liability from state or federal agencies with regard to Callahan's operations at sites in Maine, Colorado and Washington. The Company did not make any decisions with respect to generation, transport or disposal of hazardous waste at these sites. Therefore, the Company believes that it is not liable for any potential cleanup costs either directly as an operator or indirectly as a parent. The Company anticipates that further agency interaction may be possible with respect to these sites.
	Callahan operated a mine and mill in Brooksville, Maine from 1968 until 1972 and subsequently disposed of the property. In 2000, the U.S. Environmental Protection Agency, or EPA, made a formal request to the Company for information regarding the site. The site was placed on the National Priorities List on September 5, 2002, and the Maine Department of Transportation, a partial owner of the property, signed a consent order in 2005. In January 2009, the EPA and the State of Maine made additional formal requests to the Company for information relating to the site, to which the Company responded. The first phase of cleanup at the site began in April 2011.
	The Van Stone Mine in Stevens County, Washington consists of several parcels of land and was mined from 1926 until 1993 by multiple owners. Callahan sold its parcel in 1990. In February 2010, the State of Washington Department of Ecology notified Callahan that it, among others, is a potentially liable person (PLP) under Washington law. Asarco LLC ("Asarco"), an affiliate of American Smelting and Refining Company, which developed the mill on the site in 1951, settled for $3.5 million. Another potentially liable person, Vaagen Brothers, signed a consent order which allows access to the site for a Remedial Investigation and Feasibility Study. Neither the Company nor Callahan has received any further notices from the Washington Department of Ecology. On June 5, 2012, Asarco filed a lawsuit in the U.S. District Court for the Eastern District of Washington against five named defendants, including Callahan, seeking contribution for the $3.5 million settlement. Callahan filed a response and defense to the lawsuit on December 11, 2012 and stating it did not believe it had any liability to Asarco. On November 11, 2014, following the entry of the parties into a settlement agreement, the Court granted a joint motion to dismiss the proceedings between Asarco and Callahan.
	Under lease and option agreements with several owners, Callahan was involved with the Akron Mine located in Gunnison County, Colorado from 1937-1960.  The United States Forest Service (“USFS”) made formal requests for information to Callahan regarding the site in December 2003, February 2007, March 2013, and November 2013.  Callahan timely responded to each request.  In August 2014, Callahan received a notice of potential CERCLA liability from the USFS regarding environmental contamination at the Akron Mine. Callahan and the USFS are currently in discussions regarding this matter.
	Bolivian Temporary Restriction on Mining above 4,400 Meters
	On October 14, 2009, the Bolivian state-owned mining organization, COMIBOL, announced by resolution that it was temporarily suspending mining activities above the elevation of 4,400 meters above sea level while stability studies of Cerro Rico mountain are undertaken. The Company holds rights to mine above this elevation under valid contracts with COMIBOL as well as under authorized contracts with local mining cooperatives that hold their rights under contract themselves with COMIBOL. The Company temporarily adjusted its mine plan to confine mining activities to the ore deposits below 4,400 meters above sea level and timely notified COMIBOL of the need to lift the restriction. Mining in other areas above the 4,400 meter level continues to be suspended.
	The suspension may reduce production until the Company is able to resume mining above 4,400 meters. It is uncertain at this time how long the suspension will remain in place. If COMIBOL decides to restrict access above the 4,400 meter level on a permanent basis, the Company may need to write down the carrying value of the asset. It is also uncertain if any new mining or investment policies or shifts in political attitude may affect mining in Bolivia.
	Settlement of Unpatented Mining Claims Dispute at Rochester in Nevada
	In the second quarter of 2013, Coeur Rochester settled all claims associated with a dispute involving ownership of unpatented mining claims surrounding the Coeur Rochester operation and, in connection therewith, agreed to make a one-time $10.0 million cash payment and granted the 3.4% NSR royalty described above under "Rochester Production Royalties." The above settlement resulted in a $32.0 million charge in the year ended December 31, 2013.
	Pending Paramount Transaction Litigation
	Since the announcement of the Company’s proposed acquisition of Paramount, six lawsuits have been filed related to the merger agreement in the Court of Chancery of the State of Delaware.  The lawsuits assert a variety of causes of action concerning the transaction, including claims against Paramount’s directors for alleged breaches of fiduciary duty in connection with the proposed transaction, and claims against the Company for allegedly aiding and abetting such breaches of fiduciary duty.  On February 18, 2015, the court entered an order consolidating the lawsuits and providing that the consolidated case shall be captioned In re Paramount Gold and Silver Corp. Stockholders Litigation, Consolidated C.A. No. 10499-VCN.  The consolidation order directs the plaintiffs to file a consolidated amended complaint, to designate operative discovery requests, and to designate an operative motion to expedite proceedings as soon as practicable.  Defendants are not obligated to respond to complaints, motions, or discovery requests previously filed or served in any of the six constituent actions.  The Company cannot predict the outcome of these or any other lawsuits that might be filed subsequent to the date hereof relating to the transaction, nor can the Company predict the amount of time and expense that will be required to resolve these lawsuits. The Company intends to defend vigorously against these consolidated actions.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
SUPPLEMENTAL CASH FLOW INFORMATION	SUPPLEMENTAL CASH FLOW INFORMATION
	The following table presents non-cash financing and investing activities and other cash flow information:
		Year ended December 31,
	Non-cash financing and investing activities:	2014	2013	2012
	Capital lease obligations	24,879	—	1,857
	Non-cash acquisitions and related deferred taxes	—	317,826	64,133
	Other cash flow information:
	Interest paid	30,691	14,139	6,092
	Income taxes paid	20,198	26,585	54,680

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS
	On January 12, 2015, the Company entered into a definitive agreement with a subsidiary of Goldcorp Inc. to acquire 100% of the Wharf gold mine, a producing gold mine located near Lead, South Dakota, for cash consideration of $105 million. Wharf is located in the Black Hills mining district of South Dakota and has been in production for over 30 years, during which it has produced over 2.0 million ounces of gold. The mine has a current reserve base of 560,000 ounces of gold and is expected to produce 85,000 - 90,000 ounces of gold in 2015, based on Goldcorp Inc.'s public disclosures.

Recovered_Sheet1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates
	The Company's Consolidated Financial Statements have been prepared in accordance with United States Generally Accepted Accounting Principles. The preparation of the Company's Consolidated Financial Statements requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations, environmental, reclamation and closure obligations, estimates of recoverable silver and gold in leach pad inventories, estimates of fair value for certain reporting units and asset impairments, valuation allowances for deferred tax assets, and the fair value and accounting treatment of financial instruments, equity securities, and derivative instruments. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results will differ from the amounts estimated in these financial statements.
Principles of Consolidations	Principles of Consolidation
	The Consolidated Financial Statements include the wholly-owned subsidiaries of the Company, the most significant of which are Empresa Minera Manquiri S.A., Coeur Mexicana S.A. de C.V., Coeur Rochester, Inc., Coeur Alaska, Inc., and Coeur Capital, Inc. All intercompany balances and transactions have been eliminated. The Company's investments in entities in which it has less than 20% ownership interest are accounted for using the cost method.
Revenue Recognition	Revenue Recognition
	Revenue is recognized, net of treatment and refining charges, when persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed or determinable, no obligations remain and collection is probable.
	Under the Company’s concentrate sales contracts with third-party smelters, gold and silver prices are set on a specified future quotational period, typically one to three months, after the shipment date based on market prices. Revenues and costs applicable to sales are recorded on a gross basis under these contracts at the time title passes to the buyer based on the forward price for the expected settlement period. The contracts, in general, provide for provisional payment based upon provisional assays and forward metal prices. Final settlement is based on the average applicable price for the specified future quotational period and generally occurs from three to six months after shipment. The Company’s provisionally priced sales contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from the sale of concentrates measured at the forward price at the time of sale. The embedded derivative does not qualify for hedge accounting and is adjusted to fair value through revenue each period until the date of final gold and silver settlement.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents include all highly-liquid investments with an original maturity of three months or less. The Company minimizes its credit risk by investing its cash and cash equivalents with major U.S. and international banks and financial institutions located principally in the United States with a minimum credit rating of A1, as defined by Standard & Poor’s. The Company’s management believes that no concentration of credit risk exists with respect to the investment of its cash and cash equivalents.
Receivables	Receivables
	Trade receivables and other receivable balances are reported at outstanding principal amounts, net of an allowance for doubtful accounts, if deemed necessary. Management evaluates the collectability of receivable account balances to determine the allowance, if any. Management considers the other party's credit risk and financial condition, as well as current and projected economic and market conditions, in determining the amount of the allowance. Receivable balances are written off when management determines that the balance is uncollectible.
Ore on Leach Pad	Ore on Leach Pads
	The heap leach process extracts silver and gold by placing ore on an impermeable pad and applying a diluted cyanide solution that dissolves a portion of the contained silver and gold, which are then recovered in metallurgical processes.
	The Company uses several integrated steps to scientifically measure the metal content of ore placed on the leach pads. As the ore body is drilled in preparation for the blasting process, samples are taken of the drill residue which are assayed to determine estimated quantities of contained metal. The Company estimates the quantity of ore by utilizing global positioning satellite survey techniques. The Company then processes the ore through crushing facilities where the output is again weighed and sampled for assaying. A metallurgical reconciliation with the data collected from the mining operation is completed with appropriate adjustments made to previous estimates. The crushed ore is then transported to the leach pad for application of the leaching solution. As the leach solution is collected from the leach pads, it is continuously sampled for assaying. The quantity of leach solution is measured by flow meters throughout the leaching and precipitation process. After precipitation, the product is converted to doré, which is the final product produced by the mine. The inventory is stated at lower of cost or market, with cost being determined using a weighted average cost method.
	The historical cost of the metal that is expected to be extracted within twelve months is classified as current and the historical cost of metals contained within the broken ore that is expected to be extracted beyond twelve months is classified as non-current. Ore on leach pad is valued based on actual production costs incurred to produce and place ore on the leach pad, less costs allocated to minerals recovered through the leach process.
	The estimate of both the ultimate recovery expected over time and the quantity of metal that may be extracted relative to the time the leach process occurs requires the use of estimates, which are inherently inaccurate due to the nature of the leaching process. The quantities of metal contained in the ore are based upon actual weights and assay analysis. The rate at which the leach process extracts gold and silver from the crushed ore is based upon laboratory column tests and actual experience occurring over more than twenty years of leach pad operations at the Rochester mine. The assumptions used by the Company to measure metal content during each stage of the inventory conversion process includes estimated recovery rates based on laboratory testing and assaying. The Company periodically reviews its estimates compared to actual experience and revises its estimates when appropriate. Variations between actual and estimated quantities resulting from changes in assumptions and estimates that do not result in write-downs to net realizable value are accounted for on a prospective basis.
Metal and Other Inventory	Metal and Other Inventory
	Inventories include concentrate, doré, and operating materials and supplies. The classification of inventory is determined by the stage at which the ore is in the production process. All inventories are stated at the lower of cost or market, with cost being determined using a weighted average cost method. Concentrate and doré inventory includes product at the mine site and product held by refineries. Concentrate inventories associated with the Endeavor mine are held by third parties. Metal inventory costs include direct labor, materials, depreciation, depletion and amortization as well as overhead costs relating to mining activities.
Property, Plant and Equipment	Property, Plant, and Equipment
	Expenditures for new facilities, assets acquired pursuant to capital leases, new assets or expenditures that extend the useful lives of existing facilities are capitalized and depreciated using the straight-line method at rates sufficient to depreciate such costs over the shorter of estimated productive lives of such facilities, lease term, or the useful life of the individual assets. Productive lives range from 7 to 30 years for buildings and improvements and 3 to 10 years for machinery and equipment. Certain mining equipment is depreciated using the units-of-production method based upon estimated total proven and probable reserves.
Mining Properties and Mine Development	Mining Properties and Mine Development
	Capitalization of mine development costs begins once all operating permits have been secured, mineralization is classified as proven and probable reserves and a final feasibility study has been completed. Mine development costs include engineering and metallurgical studies, drilling and other related costs to delineate an ore body, the removal of overburden to initially expose an ore body at open pit surface mines and the building of access ways, shafts, lateral access, drifts, ramps and other infrastructure at underground mines. Costs incurred before mineralization is classified as proven and probable reserves are expensed and classified as exploration or pre-development expense. Mine development costs are amortized using the units of production method over the estimated life of the ore body based on recoverable ounces to be mined from proven and probable reserves. Interest expense allocable to the cost of developing mining properties and to construct new facilities is capitalized until assets are ready for their intended use.
	Drilling and related costs incurred at the Company’s operating mines are expensed as incurred in Exploration, unless the Company can conclude with a high degree of confidence, prior to the commencement of a drilling program, that the drilling costs will result in the conversion of a mineral resource into proven and probable reserves. The Company’s assessment is based on the following factors: results from previous drill programs; results from geological models; results from a mine scoping study confirming economic viability of the resource; and preliminary estimates of mine inventory, ore grade, cash flow and mine life. In addition, the Company must have all permitting and/or contractual requirements necessary to have the right to and/or control of the future benefit from the targeted ore body. The costs of a drilling program that meet these criteria are capitalized as mine development costs. Drilling and related costs of approximately $8.9 million and $11.6 million at December 31, 2014 and 2013, respectively, were capitalized.
	The cost of removing overburden and waste materials to access the ore body at an open pit mine prior to the production phase are referred to as “pre-stripping costs.” Pre-stripping costs are capitalized during the development of an open pit mine. Stripping costs incurred during the production phase of a mine are variable production costs that are included as a component of inventory to be recognized in Costs applicable to sales in the same period as the revenue from the sale of inventory.
Mineral Interests	Mineral Interests
	Significant payments related to the acquisition of land and mineral rights are capitalized. Prior to acquiring such land or mineral rights, the Company generally makes a preliminary evaluation to determine that the property has significant potential to develop an economic ore body. The time between initial acquisition and full evaluation of a property’s potential is variable and is determined by many factors including: location relative to existing infrastructure, the property’s stage of development, geological controls and metal prices. If a mineable ore body is discovered, such costs are amortized when production begins using the units-of-production method based on recoverable ounces to be mined from proven and probable reserves. If no mineable ore body is discovered, such costs are expensed in the period in which it is determined the property has no future economic value.
Impairments	We review and evaluate our long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Asset impairment is considered to exist if the total estimated undiscounted pre-tax future cash flows are less than the carrying amount of the asset. In estimating future cash flows, assets are grouped at the lowest level for which there is identifiable cash flows that are largely independent of future cash flows from other asset groups. An impairment loss is measured and recorded based on discounted estimated future cash flows. Future cash flows are estimated based on estimated quantities of recoverable minerals, expected silver and gold prices (considering current and historical prices, trends and related factors), production levels, operating costs, capital requirements and reclamation costs, all based on life-of-mine plans. The significant assumptions used in determining future cash flows for each mine site asset group at December 31, 2014, apart from production cost and capitalized expenditure assumptions unique to each operation, included long-term silver and gold prices of $19.00 and $1,275 per ounce (consistent with the Company’s long-term reserve prices), respectively, and discount rates ranging from 8.0% - 10.75% (to reflect project and country-specific risks). During 2014, 2013, and 2012, we recorded impairments of $1,472.7 million, $773.0 million, and $5.8 million, respectively, to reduce the carrying value of mining properties and property, plant and equipment as part of Write-downs. See Note 4 -- Write-Downs for additional detail.
	Existing proven and probable reserves and value beyond proven and probable reserves, including mineralization other than proven and probable reserves are included when determining the fair value of mine site asset groups at acquisition and, subsequently, in determining whether the assets are impaired. The term “recoverable minerals” refers to the estimated amount of silver and gold that will be obtained after taking into account losses during ore processing and treatment. Estimates of recoverable minerals from exploration stage mineral interests are risk adjusted based on management’s relative confidence in such materials. The ability to achieve the estimated quantities of recoverable minerals from exploration stage mineral interests involves further risks in addition to those risk factors applicable to mineral interests where proven and probable reserves have been identified, due to the lower level of confidence that the identified mineralized material could ultimately be mined economically. Assets classified as exploration potential have the highest level of risk that the carrying value of the asset can be ultimately realized, due to the still lower level of geological confidence and economic modeling.
	Silver and gold prices are volatile and affected by many factors beyond the Company’s control, including prevailing interest rates and returns on other asset classes, expectations regarding inflation, speculation, currency values, governmental decisions regarding precious metals stockpiles, global and regional demand and production, political and economic conditions and other factors may affect the key assumptions used in the Company’s impairment testing. Various factors could impact our ability to achieve forecasted production levels from proven and probable reserves. Additionally, production, capital and reclamation costs could differ from the assumptions used in the cash flow models used to assess impairment. Actual results may vary from the Company’s estimates and result in additional Write-downs.
Restricted Assets	Restricted Assets
	The Company, under the terms of its self-insurance and bonding agreements with certain banks, lending institutions and regulatory agencies, is required to collateralize certain portions of its obligations. The Company has collateralized these obligations by assigning certificates of deposit that have maturity dates ranging from three months to a year, to the respective institutions or agencies. At December 31, 2014 and 2013, the Company held certificates of deposit and cash under these agreements of $7.0 million and $7.0 million, respectively, restricted for these purposes. The ultimate timing of the release of the collateralized amounts is dependent on the timing and closure of each mine and repayment of the facility. In order to release the collateral, the Company must seek approval from certain government agencies responsible for monitoring the mine closure status. Collateral could also be released to the extent the Company is able to secure alternative financial assurance satisfactory to the regulatory agencies. The Company believes there is a reasonable probability that the collateral will remain in place beyond a twelve-month period and has therefore classified these investments as long-term.
Reclamation and Remediation Costs	Reclamation and Remediation Costs
	The Company recognizes obligations for the expected future retirement of tangible long-lived assets and other associated asset retirement costs. The fair value of a liability for an asset retirement obligation will be recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The fair value of the liability is added to the carrying amount of the associated asset and this additional carrying amount is depreciated over the life of the asset. An accretion cost, representing the increase over time in the present value of the liability, is recorded each period in Pre-development, reclamation, and other. As reclamation work is performed or liabilities are otherwise settled, the recorded amount of the liability is reduced. Future remediation costs for inactive mines are accrued based on management’s best estimate at the end of each period of the discounted costs expected to be incurred at the site. Such cost estimates include, where applicable, ongoing care and maintenance and monitoring costs. Changes in estimates are reflected prospectively in the period an estimate is revised.
Foreign Currency	Foreign Currency
	The assets and liabilities of the Company’s foreign subsidiaries are measured using U.S. dollars as their functional currency. Revenues and expenses are translated at the average exchange rate for the period. Foreign currency transaction gains and losses are included in the determination of net income or loss.
Derivative Financial Instruments	Derivative Financial Instruments
	The Company recognizes all derivatives as either assets or liabilities on the balance sheet and measures those instruments at fair value. Changes in the value of derivative instruments are recorded each period in the Consolidated Statement of Comprehensive Income (Loss) in Fair value adjustments, net. Management applies judgment in estimating the fair value of instruments that are highly sensitive to assumptions regarding commodity prices, market volatilities, and foreign currency exchange rates.
Share-based Compensation Plans	Stock-based Compensation Plans
	The Company estimates the fair value of stock options using the Black-Scholes option pricing model and stock appreciation rights (“SARs”) awards using market comparison. Stock options granted are accounted for as equity-based awards and SARs are accounted for as liability-based awards. The value of the SARs is remeasured at each reporting date. The Company estimates the fair value of performance share and performance unit grants using a Monte Carlo simulation valuation model. Performance shares granted are accounted for as equity based awards and performance shares units are accounted for as liability-based awards. The Company estimates forfeitures of stock-based awards based on historical data and periodically adjusts the forfeiture rate. The adjustment of the forfeiture rate is recorded as a cumulative adjustment in the period the forfeiture estimate is changed. Compensation costs related to stock based compensation are included in General and administrative expenses, Costs applicable to sales, and Property, plant, and equipment, net as deemed appropriate.
	Restricted stock and restricted stock units granted under the Company’s incentive plans are accounted for based on the market value of the underlying shares on the date of grant and vest in equal installments annually over three years. Restricted stock awards are accounted for as equity-based awards and restricted stock unit awards are accounted for as liability-based awards. Restricted stock units are remeasured at each reporting date. Restricted stock units are settled in cash based on the number of vested restricted stock units multiplied by the current market price of the common shares when vested. Holders of the restricted stock are entitled to vote the shares and to receive any dividends declared on the shares.
Income and Mining Taxes	Income and Mining Taxes
	The Company uses an asset and liability approach which results in the recognition of deferred tax liabilities and assets for the expected future tax consequences or benefits of temporary differences between the financial reporting basis and the tax basis of assets and liabilities, as well as operating loss and tax credit carryforwards, using enacted tax rates in effect in the years in which the differences are expected to reverse.
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of its deferred tax assets will not be realized. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. A valuation allowance has been provided for the portion of the Company’s net deferred tax assets for which it is more likely than not that they will not be realized.
Recent Accounting Standards	Recent Accounting Standards
	In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." The updated guidance provides a five-step approach to be applied to all contracts with customers and also requires expanded disclosures about revenue recognition. These changes become effective prospectively for the Company's fiscal year beginning January 1, 2017. The Company is currently evaluating the potential impact of these changes on the Company's consolidated financial position, results of operations, and cash flows.

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2014																									Dec. 31, 2013																									Dec. 31, 2012
Segment Reporting [Abstract]
Financial information relating to the reporting segments	Financial information relating to the Company’s segments is as follows (in thousands):
																										Year ended December 31, 2013	Palmarejo			San Bartolomé			Kensington			Rochester			La Preciosa			Coeur Capital			Other			Total			Year ended December 31, 2012	Palmarejo			San Bartolomé			Kensington			Rochester			Coeur Capital			Other			Total
	Year ended December 31, 2014	Palmarejo			San Bartolomé			Kensington			Rochester			La Preciosa			Coeur Capital			Other			Total				Mine			Mine			Mine			Mine																Mine			Mine			Mine			Mine
		Mine			Mine			Mine			Mine															Revenue																									Revenue
	Revenue																									Metal sales	$	324,040		$	141,721		$	148,769		$	119,254		$	—		$	12,871		$	(661	)	$	745,994		Metal sales	$	442,098		$	178,005		$	110,987		$	132,392		$	18,848		$	13,162		$	895,492
	Metal sales	$	244,003		$	117,749		$	136,960		$	123,768		$	—		$	10,046		$	—		$	632,526
																										Royalties	—			—			—			—			—			—			—			—			Royalties	—			—			—			—			—			—			—
	Royalties	—			—			—			—			—			3,216			—			3,216
																											324,040			141,721			148,769			119,254			—			12,871			(661		)	745,994				442,098			178,005			110,987			132,392			18,848			13,162			895,492
		244,003			117,749			136,960			123,768			—			13,262			—			635,742
																										Costs and Expenses																									Costs and Expenses
	Costs and Expenses																									Costs applicable to sales(1)	188,572			86,827			104,575			77,869			—			5,820			—			463,663			Costs applicable to sales(1)	197,478			71,428			87,089			72,061			8,824			17,682			454,562
	Costs applicable to sales(1)	187,276			89,659			105,342			91,462			—			4,206			—			477,945
																										Amortization	133,535			19,103			62,750			8,890			24			3,755			1,507			229,564			Amortization	145,945			16,624			41,241			6,784			4,632			806			216,032
	Amortization	69,431			19,423			43,619			20,790			84			7,015			2,074			162,436
																										Exploration	7,161			111			4,199			2,653			80			2,069			6,087			22,360			Exploration	7,575			159			3,283			3,591			1,056			10,606			26,270
	Exploration	6,671			120			8,005			2,636			236			515			3,557			21,740
																										Write-downs	642,094			—			130,694			—			—			—			205			772,993			Write-downs	—			—			—			—			—			5,825			5,825
	Write-downs	784,038			118,754			107,832			—			372,466			6,202			83,429			1,472,721
																										Other operating expense (income)	705			6,205			735			36,265			3,237			1,397			54,029			102,573			Other operating expense (income)	661			165			478			2,682			(736		)	33,813			37,063
	Other operating expense (income)	620			(251		)	796			2,813			13,961			938			48,005			66,882
																										Other income (expense)																									Other income (expense)
	Other income (expense)																									Interest income and other, net	906			2,582			(187		)	(318		)	15			(19,474		)	11,491			(4,985		)	Interest income and other, net	4,017			9,719			(77		)	358			(77		)	496			14,436
	Interest income and other, net	131			2,461			(22		)	105			(523		)	(7,141		)	(229		)	(5,218		)
																										Interest expense, net	(15,123		)	(74		)	(424		)	(20		)	—			—			(25,662		)	(41,303		)	Interest expense, net	(18,938		)	(72		)	(2,972		)	(26		)	—			(4,161		)	(26,169		)
	Interest expense, net	(9,320		)	(52		)	(214		)	(679		)	—			(1		)	(37,280		)	(47,546		)
																										Fair value adjustments, net	76,218			—			7,480			416			—			—			(1,346		)	82,768			Loss on debt extinguishment	—			—			(1,036		)	—			—			—			(1,036		)
	Fair value adjustments, net	(1,847		)	—			—			3,653			—			—			1,812			3,618
																										Income and mining tax (expense) benefit	107,748			(10,938		)	(1		)	(2,332		)	(20,856		)	2,179			82,316			158,116			Fair value adjustments, net	(31,054		)	—			4,089			—			—			3,478			(23,487		)
	Income and mining tax (expense) benefit	283,685			18,114			—			(2,224		)	132,151			1,212			26,306			459,244
																										Net income (loss)	$	(478,278	)	$	21,045		$	(147,316	)	$	(8,677	)	$	(24,182	)	$	(17,465	)	$	4,310		$	(650,563	)	Income and mining tax (expense) benefit	(18,066		)	(44,632		)	—			(2,195		)	(327		)	(5,587		)	(70,807		)
	Net income (loss)	$	(531,384	)	$	(89,433	)	$	(128,870	)	$	6,922		$	(255,119	)	$	(11,544	)	$	(146,456	)	$	(1,155,884	)
																										Segment assets(2)	$	1,164,852		$	289,272		$	343,144		$	176,789		$	410,335		$	62,678		$	111,749		$	2,558,819		Net income (loss)	$	26,398		$	54,644		$	(21,100	)	$	45,411		$	4,668		$	(61,344	)	$	48,677
	Segment assets(2)	$	341,367		$	188,616		$	215,973		$	196,765		$	39,701		$	59,848		$	41,987		$	1,084,257
																										Capital expenditures	$	33,730		$	11,568		$	21,404		$	29,406		$	1,122		$	—		$	3,583		$	100,813		Segment assets(2)	$	1,905,269		$	302,922		$	508,658		$	104,373		$	32,656		$	120,178		$	2,974,056
	Capital expenditures	$	26,084		$	7,937		$	16,220		$	11,898		$	255		$	—		$	1,850		$	64,244
																																																			Capital expenditures	$	38,456		$	25,672		$	36,994		$	11,794		$	—		$	2,725		$	115,641
																																																			(1) Excludes amortization
																																																			(2) Segment assets include receivables, prepaids, inventories, property, plant, and equipment, and mineral interests
Consolidated Assets
	In thousands	December 31, 2014			December 31, 2013
	Assets
	Total assets for reportable segments	$	1,084,257		$	2,558,819
	Cash and cash equivalents	270,861			206,690
	Other assets	100,300			120,469
	Total consolidated assets	$	1,455,418		$	2,885,978
Long Lived Assets by Country	Geographic Information
	In thousands	December 31, 2014			December 31, 2013
	Long Lived Assets
	Mexico	$	298,101		$	1,487,228
	United States	275,594			384,626
	Bolivia	107,960			235,085
	Australia	21,362			25,668
	Argentina	10,970			94,705
	Other	15,116			10,462
	Total	$	729,103		$	2,237,774
Revenue by Country	The following table indicates customers that represent 10% or more of total sales of metal for at least one of the years December 31, 2014, 2013, and 2012 (in millions):
			Years Ended December 31,
	Customer		2014			2013			2012			Segments reporting revenue
	Mitsui & Co.		$	133.8		$	70.3		$	65.6		Palmarejo, Rochester
	TD Securities		106.7			106.7			65.8			Palmarejo, Rochester
	Standard Bank		87.5			69			72.3			Palmarejo, Rochester
	China National Gold		86.8			81.5			43.8			Kensington
	Johnson Matthey		71.8			66.4			1.7			San Bartolomé
	Valcambi		33.9			77.2			414.4			Palmarejo, San Bartolomé
	INTL Commodities		22.4			84.6			58			Palmarejo, San Bartolomé, Rochester
	Auramet		10.8			111.7			94.6			Palmarejo, San Bartolomé, Kensington, Rochester
		Year ended December 31,
	In thousands	2014			2013			2012
	Revenue
	United States	$	260,728		$	268,023		$	243,379
	Mexico	245,493			324,040			442,098
	Bolivia	117,749			141,721			178,005
	Australia	10,046			12,871			18,848
	Other	$	1,726		$	(661	)	$	13,162
	Total	$	635,742		$	745,994		$	895,492

WriteDowns_Tables

Write-Downs (Tables)	12 Months Ended
	Dec. 31, 2014
Details of Impairment by Long-Lived Asset Class [Abstract]
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
		Year ended December 31,
		2014		2013		2012
	Mining properties
	Palmarejo	668,803		539,359		—
	San Bartolomé	32,328		—		—
	Kensington	67,671		82,337		—
	La Preciosa	371,411		—		—
	Joaquin	83,429		—		—
	Coeur Capital (El Gallo)	6,202		—		—
	Martha	—		205		5,825
		1,229,844		621,901		5,825
	Property, plant, and equipment
	Palmarejo	$	115,235	$	102,735	$	—
	San Bartolomé	86,426		—		—
	Kensington	40,161		48,357		—
	La Preciosa	1,055		—		—
		242,877		151,092		—
	Total	$	1,472,721	$	772,993	$	5,825

Reclamation_Tables

Reclamation (Tables)	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	Changes to the Company’s asset retirement obligations (included in Reclamation) are as follows:
	In thousands	Year ended December 31,
		2014			2013
	Asset retirement obligation - Beginning	$	55,966		$	33,008
	Accretion	4,826			3,316
	Additions and changes in estimates	6,748			19,670
	Settlements	(326		)	(28		)
	Asset retirement obligation - Ending	$	67,214		$	55,966

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The following table sets forth the weighted average fair value of stock options and the assumptions used to estimate the fair value of the stock options using the Black-Scholes option valuation model:
		2014				2013				2012
	Weighted average fair value of stock options granted	$	3.79			$	12.6			$	15.77
	Volatility	50.93		%		76.74		%		70.56		%
	Expected life in years	3.9				5				5.5
	Risk-free interest rate	1.25		%		0.84		%		0.89		%
	Dividend yield	—				—				—
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity	The following table summarizes stock option and SAR activity for the years ended December 31, 2014, 2013, and 2012:
		Stock Options							SARs
		Shares			Weighted				Shares			Weighted
					Average							Average
					Exercise							Exercise
					Price							Price
	Outstanding at December 31, 2011	321,607			$	24.6			107,639			$	13.46
	Granted	151,102			26.97				—			—
	Exercised	(40,173	)		11.84				(34,385	)		12.73
	Canceled/forfeited	(62,536	)		29.22				(4,389	)		15.4
	Outstanding at December 31, 2012	370,000			30.2				68,865			13.83
	Granted	190,452			20.41				—			—
	Exercised	(13,027	)		10.77				(6,617	)		13.14
	Canceled/forfeited	(131,855	)		29.3				(12,039	)		15.4
	Outstanding at December 31, 2013	415,570			27.36				50,209			14.15
	Granted	415,172			9.45				—			—
	Canceled/forfeited	(232,396	)		23.94				(3,637	)		15.4
	Outstanding at December 31, 2014	598,346			$	16.26			46,572			$	14.06
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
			Options Outstanding									Options Exercisable
	Range of		Number			Weighted Average				Weighted		Number		Weighted		Weighted
	Exercise Price		Outstanding			Exercise				Average		Exercisable		Average		Average
						Price				Remaining				Exercise		Remaining
										Contractual				Price		Contractual Life (Years)
										Life (Years)
	$ 0.00-$10.00		284,866			$	9.34			9.04		11,034		$	10	4.09
	$10.00-$20.00		121,540			15.51				8.43		33,646		17.33		8.11
	$20.00-$30.00		176,777			25.68				6.88		107,546		26.37		6.27
	$30.00-$40.00		9,566			38.25				2.44		9,566		38.25		2.44
	$40.00-$50.00		3,336			48.5				3.03		3,336		48.5		3.03
	$50.00-$60.00		2,261			51.4				1.14		2,261		51.4		1.14
			598,346			$	16.26					167,389		$	24.93
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table summarizes restricted stock and restricted stock units activity for the years ended December 31, 2014, 2013, and 2012:
		Restricted Stock							Restricted Stock Units
		Number of			Weighted				Number of			Weighted Average
		Shares			Average				Units			Fair Value
					Grant Date
					Fair Value
	Outstanding at December 31, 2011	173,509			11.37				45,518			27.32
	Granted	230,096			26.4				—			—
	Vested	(95,336	)		23.15				(31,456	)		25.92
	Cancelled/Forfeited	(68,571	)		27.43				(2,651	)		24.6
	Outstanding at December 31, 2012	239,698			25.38				11,411			24.14
	Granted	573,467			15.38				—			—
	Vested	(90,963	)		26.83				(11,411	)		22.74
	Cancelled/Forfeited	(109,116	)		23.3				—			—
	Outstanding at December 31, 2013	613,086			$	16.68			—			$	—
	Granted	695,897			9.83				—			—
	Vested	(234,103	)		17.16				—			—
	Cancelled/Forfeited	(172,881	)		11.87				—			—
	Outstanding at December 31, 2014	901,999			$	12.19			—			$	—
Schedule of Nonvested Performance-based Units Activity	The following table summarizes performance shares and performance units’ activity for the years ended December 31, 2014, 2013, and 2012:
		Performance Shares							Performance Units
		Number of			Weighted				Number of			Weighted Average
		Shares			Average				Units			Fair Value
					Grant Date
					Fair Value
	Outstanding at December 31, 2011	105,929			$	16.29			84,539			$	35.41
	Granted	145,508			25.78				32,498			—
	Vested	(111,703	)		7.96				(74,845	)		31.17
	Cancelled/Forfeited	(30,575	)		42.11				(7,953	)		49.2
	Outstanding at December 31, 2012	109,159			26.92				34,239			39.78
	Granted	173,773			23.35				34,239			38.02
	Vested	(4,160	)		30.97				(68,478	)		38.02
	Cancelled/Forfeited	(68,377	)		34.49				—			—
	Outstanding at December 31, 2013	210,395			28.04				—			—
	Granted	358,398			12.21				—			—
	Vested	(34,611	)		27.18				—			—
	Cancelled/Forfeited	(17,352	)		27.15				—			—
	Outstanding at December 31, 2014	516,830			$	17.61			—			$	—

Income_and_Mining_Taxes_Tables

Income and Mining Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of Income (loss) before income taxes are below:
		Year ended December 31,
	in thousands	2014				2013			2012
	United States	$	(213,883	)		$	(242,562	)	$	(3,443	)
	Foreign	(1,401,245		)		(566,117		)	122,927
	Total	$	(1,615,128	)		$	(808,679	)	$	119,484
	The components of the consolidated Income and mining tax (expense) benefit from continuing operations are below:
		Year ended December 31,
	in thousands	2014				2013			2012
	Current:
	United States	$	904			$	4		$	(257	)
	United States — State mining taxes	(879		)		(714		)	(2,195		)
	United States — Foreign withholding tax	(6,250		)		397			(736		)
	Argentina	(71		)		(137		)	976
	Australia	—				(914		)	(1,760		)
	Mexico	(1,124		)		(9,046		)	(7,814		)
	Bolivia	(4,008		)		(6,716		)	(43,546		)
	Canada	(145		)		(1,936		)	—
	Deferred:
	Argentina	24,478				8,062			—
	Australia	(401		)		(2		)	(223		)
	Bolivia	22,122				(4,222		)	(1,087		)
	Canada	1,807				—			—
	Mexico	417,068				94,851			(10,579		)
	United States	5,743				78,489			(3,586		)
	Income tax (expense) benefit	$	459,244			$	158,116		$	(70,807	)
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the Company’s effective tax rate with the federal statutory tax rate for the periods indicated is below:
		Year ended December 31,
	in thousands	2014				2013			2012
	Tax benefit (expense) from continuing operations	$	565,295			$	283,038		$	(41,819	)
	State tax provision from continuing operations	20,253				2,245			(3,151		)
	Percentage depletion and related deductions	—				—			7,461
	Change in valuation allowance	(128,344		)		(106,802		)	(12,651		)
	Non-deductible imputed interest	—				(214		)	(525		)
	Uncertain tax positions	(4,425		)		(5,209		)	(9,849		)
	U.S. and foreign non-deductible expenses	(4,892		)		(2,383		)	(4,206		)
	Foreign exchange rates	23,672				13,937			(10,416		)
	Foreign inflation and indexing	3,765				2,937			712
	Foreign tax rate differences	(63,930		)		(24,108		)	3,967
	Foreign withholding and other foreign taxes	91,882				(100,331		)	(5,861		)
	Foreign tax credits and other, net	(44,032		)		13,153			5,531
	Change in Mexico permanent reinvestment assertion	—				81,853			—
		$	459,244			$	158,116		$	(70,807	)
Schedule of Deferred Tax Assets and Liabilities	At December 31, 2014 and 2013, the significant components of the Company’s deferred tax assets and liabilities are below:
		Year ended December 31,
	In thousands	2014				2013
	Deferred tax liabilities:
	Mineral properties	$	—			$	344,152
	Mexican mining royalty tax	7,586				76,386
	Foreign subsidiaries — unremitted earnings	45,249				182,464
	Inventory	1,100				2,746
	Property, plant, and equipment, net	—				33,094
		$	53,935			$	638,842
	Deferred tax assets:
	Net operating loss carryforwards	153,689				130,170
	Mineral properties	70,510				—
	Property, plant, and equipment	46,042				—
	Foreign subsidiaries — future tax credits	—				163,947
	Royalty and other long-term debt	5,863				11,616
	Capital loss carryforwards	35,251				34,930
	Asset retirement obligation	21,586				18,589
	Unrealized foreign currency loss and other	8,213				9,567
	Accrued expenses	14,773				14,756
	Tax credit carryforwards	56,322				23,585
		412,249				407,160
	Valuation allowance	(409,883		)		(289,378		)
		2,366				117,782
	Net deferred tax liabilities	$	51,569			$	521,060
Summary of Valuation Allowance	Based upon this analysis, the Company has recorded valuation allowances as follows:
		Year ended December 31,
	In thousands	2014				2013
	U.S.	$	305,534			$	236,653
	Argentina	21,520				17,005
	Canada	2,009				4,453
	Bolivia	15,948				—
	Mexico	33,189				—
	New Zealand	28,710				27,292
	Other	2,973				3,975
		$	409,883			$	289,378
Summary of Income Tax Contingencies	A reconciliation of the beginning and ending amount related to unrecognized tax benefits is below (in thousands):
	Unrecognized tax benefits at January 1, 2013	$	10,511
	Gross increase to current period tax positions	2,231
	Gross increase to prior period tax positions	2,761
	Reductions in unrecognized tax benefits resulting from a lapse of the applicable statue of limitations	(32		)
	Unrecognized tax benefits at December 31, 2013	$	15,471
	Gross increase to current period tax positions	1,856
	Gross increase to prior period tax positions	524
	Reductions in unrecognized tax benefits resulting from a lapse of the applicable statue of limitations	(1,767		)
	Unrecognized tax benefits at December 31, 2014	$	16,084
Summary of Tax Credit Carryforwards	The Company has the following tax attribute carryforwards at December 31, 2014, by jurisdiction (in thousands):
		U.S.			Argentina			Canada		Mexico		New Zealand	Other	Total
	Regular net operating losses	245,683			16,588			1,633		49,747		102,535	22,952	439,138
	Alternative minimum tax net operating losses	117,362			—			—		—		—	—	117,362
	Capital losses	91,019			—			—		—		—	—	91,019
	Alternative minimum tax credits	4,142			—			—		—		—	—	4,142
	Foreign tax credits	52,181			—			—		—		—	—	52,181

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
		Year ended December 31,
	In thousands except per share amounts	2014			2013			2012
	Net income (loss) available to common stockholders	$	(1,155,884	)	$	(650,563	)	$	48,677
	Weighted average shares:
	Basic	102,441			97,864			89,437
	Effect of stock-based compensation plans	—			—			166
	Diluted	102,441			97,864			89,603
	Income (loss) per share:
	Basic	$	(11.28	)	$	(6.65	)	$	0.54
	Diluted	$	(11.28	)	$	(6.65	)	$	0.54

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014																				Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
	Description	Valuation technique	Unobservable input	Range / Weighted Average																	Description	Valuation technique	Unobservable input	Range / Weighted Average
	Property, plant, and equipment and Mining properties	Discounted cash flow	Discount rate	8.0% - 10.75%																	Property, plant, and equipment and Mining properties	Discounted cash flow	Discount rate	8.5% - 10.5%
			Long-term silver price	$19.00																			Long-term silver price	$25.00
			Long-term gold price	$1,275																			Long-term gold price	$1,450
Schedule of Fair Value Adjustments to Comprehensive income (Loss)	The following table presents the components of Fair value adjustments, net:
			Year ended December 31,
	In thousands		2014				2013				2012
	Palmarejo royalty obligation embedded derivative		$	(2,001	)		$	76,200			$	(31,053	)
	Rochester NSR royalty obligation		3,653				416				—
	Silver and gold options		1,058				7,119				4,302
	Foreign exchange contracts		908				(967		)		3,264
	Fair value adjustments, net		$	3,618			$	82,768			$	(23,487	)
Financial assets and liabilities measured at fair value on recurring basis	The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
		Fair Value at December 31, 2014
	In thousands	Total				Level 1				Level 2				Level 3
	Assets:
	Short-term investments	$	138			$	138			$	—			$	—
	Equity securities	5,982				4,603				—				1,379
	Silver and gold options	3,882				—				3,882				—
		$	10,002			$	4,741			$	3,882			$	1,379
	Liabilities:
	Palmarejo royalty obligation embedded derivative	$	21,912			$	—			$	—			$	21,912
	Rochester NSR royalty obligation	15,370				—				—				15,370
	Silver and gold options	1,039				—				1,039				—
	Other derivative instruments, net	805				—				805				—
		$	39,126			$	—			$	1,844			$	37,282
		Fair Value at December 31, 2013
	In thousands	Total				Level 1				Level 2				Level 3
	Assets:
	Equity securities	$	14,521			$	14,521			$	—			$	—
	Silver and gold options	135				—				135				—
		$	14,656			$	14,521			$	135			$	—
	Liabilities:
	Palmarejo royalty obligation embedded derivative	$	40,338			$	—			$	—			$	40,338
	Rochester NSR royalty obligation	21,630				—				—				21,630
	Other derivative instruments, net	1,591				—				1,591				—
		$	63,559			$	—			$	1,591			$	61,968
Changes in the fair value of the Company's Level 3 financial liabilities	The following tables present the changes in the fair value of the Company's Level 3 financial liabilities for the years ended December 31, 2014 and 2013:
		Year ended December 31, 2014
	In thousands	Balance at the beginning of the period				Additions				Revaluation				Settlements			Transfers from Level 1		Balance at the
																			end of the
																			period
	Palmarejo royalty obligation embedded derivative	$	40,338			$	—			$	2,001			$	(20,427	)	$	—	$	21,912
	Rochester NSR royalty obligation	21,630				—				(3,653		)		(2,607		)	—		15,370
	Equity securities	—				69				(55		)		—			1,365		1,379
		Year ended December 31, 2013
	In thousands	Balance at the beginning of the period				Additions				Revaluation				Settlements			Transfers from Level 2		Balance at the
																			end of the
																			period
	Palmarejo royalty obligation embedded derivative	$	—			$	—			$	(76,200	)		$	(28,560	)	$	145,098	$	40,338
	Rochester NSR royalty obligation	—				22,046				(416		)		—			—		21,630
Financial Assets and Liabilities not Measured at Fair Value	The fair value of financial assets and liabilities carried at book value in the financial statements at December 31, 2014 and December 31, 2013 is presented in the following table:
		31-Dec-14
	In thousands	Book Value				Fair Value				Level 1				Level 2			Level 3
	Liabilities:
	3.25% Convertible Senior Notes due 2028	$	5,334			$	4,979			$	—			$	4,979		$	—
	7.875% Senior Notes due 2021	437,454				343,305				—				343,305			—
	San Bartolomé Line of Credit	14,785				14,785				—				14,785			—
	Palmarejo gold production royalty obligation	34,047				38,290				—				—			38,290
		31-Dec-13
	In thousands	Book Value				Fair Value				Level 1				Level 2			Level 3
	Liabilities:
	3.25% Convertible Senior Notes due 2028	$	5,334			$	5,067			$	5,067			$	—		$	—
	7.875% Senior Notes due 2021	300,000				307,314				307,314				—			—
	Palmarejo gold production royalty obligation	51,193				65,212				—				—			65,212

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative instruments, future settlement	At December 31, 2014, the Company had the following derivative instruments that settle in each of the years indicated:
	In thousands except average prices and notional ounces	2015				2016				Thereafter
	Palmarejo gold production royalty	$	41,981			$	23,779			$	—
	Average gold price in excess of minimum contractual deduction	$	775			$	774			$	—
	Notional ounces	54,171				30,744				—
	Silver concentrate sales contracts	$	10,392			$	—			$	—
	Average silver price	$	16.35			$	—			$	—
	Notional ounces	635,614				—				—
	Gold concentrate sales contracts	$	35,576			$	—			$	—
	Average gold price	$	1,221			$	—			$	—
	Notional ounces	29,137				—				—
	Gold put options purchased	$	14,400			$	—			$	—
	Average gold strike price	$	1,200			$	—			$	—
	Notional ounces	12,000				—				—
	Silver put options purchased	$	11,250			$	—			$	—
	Average silver strike price	$	18			$	—			$	—
	Notional ounces	625,000				—				—
	Gold put options sold	$	(12,600	)		$	—			$	—
	Average gold strike price	$	1,050			$	—			$	—
	Notional ounces	12,000				—				—
	Silver put options sold	$	(10,000	)		$	—			$	—
	Average silver strike price	$	16			$	—			$	—
	Notional ounces	625,000				—				—
Fair value of the derivative instruments	The following summarizes the classification of the fair value of the derivative instruments:
		December 31, 2014
	In thousands	Prepaid expenses and other				Accrued liabilities and other				Current portion of royalty obligation				Non-current portion of royalty obligation
	Palmarejo gold production royalty	$	—			$	—			$	14,405			$	7,507
	Silver and gold options	3,882				1,039
	Concentrate sales contracts	43				848
		$	3,925			$	1,887			$	14,405			$	7,507
		December 31, 2013
		Prepaid expenses and other				Accrued liabilities and other				Current portion of royalty obligation				Non-current portion of royalty obligation
	Foreign exchange contracts	$	38			$	947			$	—			$	—
	Palmarejo gold production royalty	—				—				17,650				22,688
	Silver and gold options	135				—				—				—
	Concentrate sales contracts	11				693				—				—
		$	184			$	1,640			$	17,650			$	22,688
Gain losses on derivative instruments	The following represent mark-to-market gains (losses) on derivative instruments for the years ended December 31, 2014, 2013, and 2012 (in thousands):
				Year ended December 31,
	Financial statement line	Derivative		2014				2013				2012
	Sales of metal	Concentrate sales contracts		$	(123	)		$	(1,995	)		$	1,682
	Costs applicable to sales	Foreign exchange contracts		924				589				(1,621		)
	Fair value adjustments, net	Foreign exchange contracts		(16		)		(985		)		3,264
	Fair value adjustments, net	Palmarejo gold royalty		(2,001		)		76,200				(31,053		)
	Fair value adjustments, net	Silver and gold options		1,058				7,119				4,302
				$	(158	)		$	80,928			$	(23,426	)

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	Total consideration paid and fair value of assets acquired in the GRC acquisition are as follows (in thousands):
	Total purchase price	26,047
	Total liabilities assumed	8,605
	Total consideration	$	34,652
	Total assets acquired	$	34,652
	Total purchase price	295,841
	Total liabilities assumed	116,955
	Total consideration	$	412,796
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
	Total assets acquired	$	412,796

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investment in Marketable Securities [Abstract]
Investments
		At December 31, 2014
	In thousands	Cost				Gross				Gross				Estimated
						Unrealized				Unrealized				Fair Value
						Losses				Gains
	Equity securities	$	5,687			$	(8	)		$	303			$	5,982
		At December 31, 2013
	In thousands	Cost				Gross				Gross				Estimated
						Unrealized				Unrealized				Fair Value
						Losses				Gains
	Equity securities	$	17,649			$	(3,300	)		$	172			$	14,521
Gross unrealized losses on investment securities	The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at December 31, 2014:
		Less than twelve months							Twelve months or more							Total
	In thousands	Unrealized Losses			Fair Value				Unrealized Losses			Fair Value				Unrealized Losses			Fair Value
	Equity securities	$	(8	)	$	38			$	—		$	—			$	(8	)	$	38

Receivables_Tables

Receivables (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Receivables	Receivables consist of the following:
	In thousands	December 31, 2014		December 31, 2013
	Current receivables:
	Trade receivables	$	20,448	$	17,303
	Income tax receivable	30,045		8,363
	Value added tax receivable	63,805		49,168
	Other	2,623		6,240
		$	116,921	$	81,074
	Non-current receivables:
	Value added tax receivable	$	21,686	$	36,574
	Total Receivables	$	138,607	$	117,648

Inventory_and_Ore_on_Leach_Pad1

Inventory and Ore on Leach Pads (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories	Inventory consists of the following:
	In thousands	December 31, 2014		December 31, 2013
	Inventory:
	Concentrate	$	23,563	$	14,855
	Precious metals	40,870		52,250
	Supplies	50,498		64,918
		$	114,931	$	132,023
	Ore on Leach Pads:
	Current	$	48,204	$	50,495
	Non-Current	37,889		31,528
		$	86,093	$	82,023
	Total Inventory and Ore on Leach Pads	$	201,024	$	214,046

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, plant and equipment	Property, plant, and equipment consist of the following:
	In thousands	December 31, 2014			December 31, 2013
	Land	$	1,752		$	1,764
	Facilities and equipment	647,181			855,318
	Capital leases	28,680			16,133
		677,613			873,215
	Accumulated amortization	(464,852		)	(395,520		)
		212,761			477,695
	Construction in progress	15,150			8,578
	Property, plant, and equipment, net	$	227,911		$	486,273

Mining_Properties_Tables

Mining Properties (Tables)	12 Months Ended
	Dec. 31, 2014
Mining Properties [Abstract]
Mining Properties	Mining properties consist of the following (in thousands):
	December 31, 2014	Palmarejo			San			Kensington			Rochester			La Preciosa		Joaquin		Coeur Capital			Total
					Bartolomé
	Mine development	$	137,821		$	49,305		$	217,138		$	153,535		$	—	$	—	$	—		$	557,799
	Accumulated amortization	(121,906		)	(26,106		)	(106,865		)	(113,533		)	—		—		—			(368,410		)
		15,915			23,199			110,273			40,002			—		—		—			189,389
	Mineral interests	521,349			17,560			—			—			49,059		10,000		81,461			679,429
	Accumulated amortization	(332,032		)	(10,143		)	—			—			—		—		(25,451		)	(367,626		)
		189,317			7,417			—			—			49,059		10,000		56,010			311,803
	Mining properties, net	$	205,232		$	30,616		$	110,273		$	40,002		$	49,059	$	10,000	$	56,010		$	501,192
	December 31, 2013	Palmarejo			San			Kensington			Rochester			La Preciosa		Joaquin		Coeur Capital			Total
					Bartolomé
	Mine development	$	151,845		$	70,761		$	268,351		$	150,348		$	—	$	—	$	—		$	641,305
	Accumulated amortization	(110,143		)	(22,236		)	(80,032		)	(103,130		)	—		—		—			(315,541		)
		41,702			48,525			188,319			47,218			—		—		—			325,764
	Mineral interests	1,146,572			26,643			—			—			408,352		93,429		78,133			1,753,129
	Accumulated amortization	(300,187		)	(8,759		)	—			—			—		—		(18,446		)	(327,392		)
		846,385			17,884			—			—			408,352		93,429		59,687			1,425,737
	Mining properties, net	$	888,087		$	66,409		$	188,319		$	47,218		$	408,352	$	93,429	$	59,687		$	1,751,501
	The Palmarejo mine is an underground and open pit silver and gold mine located in the State of Chihuahua in northern Mexico, and the company controls a large portion of the properties surrounding the mine. The Palmarejo mine commenced production in April 2009.
	The San Bartolomé mine is a silver mine located near the city of Potosi, Bolivia. The mineral rights for the San Bartolomé project are held through long-term joint venture/lease agreements with several local independent mining co-operatives and the Bolivian state owned mining organization, (“COMIBOL”). The Company commenced commercial production at San Bartolomé in June 2008.
	The Kensington mine is an underground gold mine and consists of the Kensington and adjacent Jualin properties located north-northwest of Juneau, Alaska. The Company commenced commercial production in July 2010.
	The Company has conducted operations at the Rochester silver and gold mine, located in northwestern Nevada, since September 1986. The mine utilizes the heap-leaching process to extract both silver and gold from ore mined using open pit methods.
	The La Preciosa silver and gold project is located in the State of Durango in northern Mexico. The Company completed a feasibility study in 2014 and has deferred construction activities until expected returns improve.
	The Joaquin silver and gold project is located in the Santa Cruz province of southern Argentina. The Company commenced exploration of the property located north of the Company's Martha silver mine in November 2007.
	The Company's mineral interests held by Coeur Capital primarily consist of the Endeavor silver stream acquired by the Company in May 2005 and amended in March 2006, under which the Company owns all silver production and reserves up to a total of 20.0 million payable ounces at the Endeavor mine in Australia, which is owned and operated by Cobar Operations Pty. Limited, a wholly-owned subsidiary of CBH Resources Ltd. The Company has received 5.4 million payable ounces to-date and the current ore reserve contains 1.7 million payable ounces.
	Coeur Capital also holds royalties on McEwen Mining Inc.’s El Gallo/Magistral mine in Mexico, currently paying a 3.5% NSR royalty, a 1.5% NSR royalty on Dynasty Metals & Mining, Inc.’s Zaruma mine in Ecuador, a 2.0% NSR royalty on Mandalay Resources Corp.’s Cerro Bayo mine in Chile, and royalties on other non-producing properties. Another Coeur subsidiary owns an 80% interest in a 2.5% royalty on Newmont Mining Corporation's Correnso mine in New Zealand. Royalty revenue is immaterial to the Company.

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long term debt and capital lease obligations	Long-term debt and capital lease obligations at December 31, 2014 and December 31, 2013 are as follows:
		December 31, 2014						December 31, 2013
	In thousands	Current			Non-Current			Current			Non-Current
	3.25% Convertible Senior Notes due 2028	$	5,334		$	—		$	—		$	5,334
	7.875% Senior Notes due 2021	—			437,454			—			300,000
	San Bartolomé Letter of Credit	4,481			10,304			—			—
	Capital lease obligations	7,683			13,141			2,505			796
		$	17,498		$	460,899		$	2,505		$	306,130
Interest expenses incurred for various debt instruments	Interest expense consists of the following:
		Year ended December 31,
	In thousands	2014			2013			2012
	3.25% Convertible Senior Notes due 2028	$	173		$	466		$	1,581
	7.875% Senior Notes due 2021	32,741			21,853			—
	Revolving Credit Facility	179			612			213
	Loss on Revolving Credit Facility	3,035			—			2,339
	Capital lease obligations	972			415			997
	Other debt obligations	—			291			881
	Accretion of Palmarejo gold production royalty obligation	10,773			17,641			19,139
	Amortization of debt issuance costs	1,740			2,143			1,146
	Accretion of debt (premium) discount	(357		)	576			2,536
	Capitalized interest	(1,710		)	(2,694		)	(2,663		)
	Total interest expense, net of capitalized interest	$	47,546		$	41,303		$	26,169

Supplemental_Guarantor_Informa1

Supplemental Guarantor Information (Tables)	12 Months Ended
	Dec. 31, 2014																Dec. 31, 2013																Dec. 31, 2012
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Comprehensive Income (Loss)	CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)																CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)																CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME (LOSS)
	YEAR ENDED DECEMBER 31, 2014																YEAR ENDED DECEMBER 31, 2013																YEAR ENDED DECEMBER 31, 2012
	In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Revenue	$	—		$	261,963		$	373,779		$	—		$	635,742		Revenue	$	—		$	268,023		$	477,971		$	—		$	745,994		Revenue	$	—		$	243,380		$	652,112		$	—		$	895,492
	COSTS AND EXPENSES																COSTS AND EXPENSES																COSTS AND EXPENSES
	Costs applicable to sales(1)	—			196,805			281,140			—			477,945			Costs applicable to sales(1)	—			182,444			281,219			—			463,663			Costs applicable to sales(1)	—			159,151			295,411			—			454,562
	Amortization	1,805			65,100			95,531			—			162,436			Amortization	1,066			71,655			156,843			—			229,564			Amortization	521			48,065			167,446			—			216,032
	General and administrative	39,976			6			863			—			40,845			General and administrative	50,213			3,245			1,885			—			55,343			General and administrative	30,699			1,101			1,177			—			32,977
	Exploration	3,560			11,157			7,023			—			21,740			Exploration	1,602			8,920			11,838			—			22,360			Exploration	1,946			7,930			16,394			—			26,270
	Write-downs	—			107,832			1,364,889			—			1,472,721			Litigation settlement	—			32,046			—			—			32,046			Write-downs	—			—			5,825			—			5,825
	Pre-development, reclamation, and other	8,813			3,889			13,335			—			26,037			Write-downs	—			130,694			642,299			—			772,993			Pre-development, reclamation, and other	—			1,323			2,763			—			4,086
	Total costs and expenses	54,154			384,789			1,762,781			—			2,201,724			Pre-development, reclamation, and other	—			3,093			12,091			—			15,184			Total costs and expenses	33,166			217,570			489,016			—			739,752
	OTHER INCOME (EXPENSE), NET																Total costs and expenses	52,881			432,097			1,106,175			—			1,591,153			Loss on debt extinguishments	—			(1,036		)	—			—			(1,036		)
	Fair value adjustments, net	1,812			3,653			(1,847		)	—			3,618
																	OTHER INCOME (EXPENSE), NET																Fair value adjustments, net	3,477			4,089			(31,053		)	—			(23,487		)
	Impairment of equity securities	—			(6,593		)	—			—			(6,593		)	Fair value adjustments, net	(1,346		)	7,896			76,218			—			82,768
																																	Impairment of equity securities	(605		)	—			—			—			(605		)
	Interest income and other, net	4,406			(430		)	227			(2,828		)	1,375			Impairment of equity securities	(18,097		)	(211		)	—			—			(18,308		)
																																	Interest income and other, net	5,744			859			13,071			(4,633		)	15,041
	Interest expense, net of capitalized interest	(38,389		)	(891		)	(11,094		)	2,828			(47,546		)	Interest income and other, net	13,408			(1,539		)	4,602			(3,148		)	13,323
																																	Interest expense, net of capitalized interest	(4,158		)	(2,997		)	(23,647		)	4,633			(26,169		)
	Total other income (expense), net	(32,171		)	(4,261		)	(12,714		)	—			(49,146		)	Interest expense, net of capitalized interest	(25,652		)	(445		)	(18,354		)	3,148			(41,303		)
																																	Total other income (expense), net	4,458			915			(41,629		)	—			(36,256		)
	Income (Loss) before income and mining taxes	(86,325		)	(127,087		)	(1,401,716		)	—			(1,615,128		)	Total other income (expense), net	(31,687		)	5,701			62,466			—			36,480
																																	Income (Loss) before income and mining taxes	(28,708		)	26,725			121,467			—			119,484
	Income and mining tax (expense) benefit	1,742			(2,224		)	459,726			—			459,244			Income (Loss) before income and mining taxes	(84,568		)	(158,373		)	(565,738		)	—			(808,679		)
																																	Income and mining tax (expense) benefit	(3,844		)	(2,930		)	(64,033		)	—			(70,807		)
	Income (Loss) after income and mining taxes	(84,583		)	(129,311		)	(941,990		)	—			(1,155,884		)	Income and mining tax (expense) benefit	78,332			(155		)	79,939			—			158,116
																																	Income (Loss) after income and mining taxes	(32,552		)	23,795			57,434			—			48,677
	Equity income (loss) in consolidated subsidiaries	(1,071,301		)	(4,181		)	—			1,075,482			—			Income (Loss) after income and mining taxes	(6,236		)	(158,528		)	(485,799		)	—			(650,563		)
																																	Equity income (loss) in consolidated subsidiaries	81,229			—			—			(81,229		)	—
	NET INCOME (LOSS)	$	(1,155,884	)	$	(133,492	)	$	(941,990	)	$	1,075,482		$	(1,155,884	)	Equity income (loss) in consolidated subsidiaries	(644,327		)	(68		)	—			644,395			—
																																	NET INCOME (LOSS)	$	48,677		$	23,795		$	57,434		$	(81,229	)	$	48,677
	OTHER COMPREHENSIVE INCOME (LOSS), net of tax:																NET INCOME (LOSS)	$	(650,563	)	$	(158,596	)	$	(485,799	)	$	644,395		$	(650,563	)
	Unrealized gain (loss) on equity securities, net of tax	(2,290		)	(2,272		)	—			2,272			(2,290		)																	OTHER COMPREHENSIVE INCOME (LOSS), net of tax:
																	OTHER COMPREHENSIVE INCOME (LOSS), net of tax:																Unrealized gain (loss) on equity securities, net of tax	(3,351		)	—			—			—			(3,351		)
	Reclassification adjustments for impairment of equity securities, net of tax	4,042			4,042			—			(4,042		)	4,042			Unrealized gain (loss) on equity securities, net of tax	(8,489		)	(552		)	—			552			(8,489		)
																																	Reclassification adjustments for impairment of equity securities, net of tax	605			—			—			—			605
	Reclassification adjustments for realized loss on sale of equity securities, net of tax	346			328			—			(328		)	346			Reclassification adjustments for impairment of equity securities, net of tax	11,221			211			—			(211		)	11,221
																																	Other comprehensive income (loss)	(2,746		)	—			—			—			(2,746		)
	Other comprehensive income (loss)	2,098			2,098			—			(2,098		)	2,098			Reclassification adjustments for realized loss on sale of equity securities, net of tax	83			—			—			—			83
																																	COMPREHENSIVE INCOME (LOSS)	$	45,931		$	23,795		$	57,434		$	(81,229	)	$	45,931
	COMPREHENSIVE INCOME (LOSS)	$	(1,153,786	)	$	(131,394	)	$	(941,990	)	$	1,073,384		$	(1,153,786	)	Other comprehensive income (loss)	2,815			(341		)	—			341			2,815
																																	(1) Excludes amortization.
																	COMPREHENSIVE INCOME (LOSS)	$	(647,748	)	$	(158,937	)	$	(485,799	)	$	644,736		$	(647,748	)
Schedule of Condensed Cash Flow Statement	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS																CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	YEAR ENDED DECEMBER 31, 2014																YEAR ENDED DECEMBER 31, 2013																YEAR ENDED DECEMBER 31, 2012
																	In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated			CASH FLOWS FROM OPERATING ACTIVITIES:																CASH FLOWS FROM OPERATING ACTIVITIES:
	CASH FLOWS FROM OPERATING ACTIVITIES:																Cash provided by (used in) operating activities	$	(701,653	)	$	17,456		$	151,491		$	646,173		$	113,467		Cash provided by (used in) operating activities	$	58,754		$	37,426		$	256,683		$	(81,229	)	271,634
	Cash provided by (used in) operating activities	$	(1,144,474	)	$	41,292		$	80,627		$	1,075,482		52,927
																	CASH FLOWS FROM INVESTING ACTIVITIES																CASH FLOWS FROM INVESTING ACTIVITIES
	CASH FLOWS FROM INVESTING ACTIVITIES	—			—			—									Capital expenditures	(3,573		)	(50,810		)	(46,430		)	—			(100,813		)	Capital expenditures	(1,531		)	(48,788		)	(65,322		)	—			(115,641		)
	Capital expenditures	(1,849		)	(28,118		)	(34,277		)	—			(64,244		)	Purchase of short term investments and equity securities	(2,921		)	(66		)	(5,065		)	—			(8,052		)	Purchase of short term investments and equity securities	(12,913		)	(46		)	—			—			(12,959		)
	Purchase of short term investments and equity securities	(50,013		)	(429		)	(71		)	—			(50,513		)	Sales and maturities of short term investments and equity securities	29,274			75			5,447			—			34,796			Sales and maturities of short term investments and equity securities	21,590			45			60			—			21,695
	Sales and maturities of short term investments and equity securities	49,069			5,261			14			—			54,344			Acquisitions	(113,214		)	(3,684		)	—			—			(116,898		)	Acquisitions	(29,338		)	—			41			—			(29,297		)
	Acquisitions	(12,079		)	(4,000		)	(5,250		)	—			(21,329		)	Other	3,266			444			768			—			4,478			Other	3,538			130			(581		)	—			3,087
	Other	—			48			(40		)	—			8			Investments in consolidated subsidiaries	642,617			68			3,488			(646,173		)	—			Investments in consolidated subsidiaries	(81,229		)	—			—			81,229			—
	Investments in consolidated subsidiaries	1,120,382			4,106			—			(1,124,488		)	—			CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	555,449			(53,973		)	(41,792		)	(646,173		)	(186,489		)	CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(99,883		)	(48,659		)	(65,802		)	81,229			(133,115		)
	CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,105,510			(23,132		)	(39,624		)	(1,124,488		)	(81,734		)	CASH FLOWS FROM FINANCING ACTIVITIES:																CASH FLOWS FROM FINANCING ACTIVITIES:
																	Issuance of notes and bank borrowings	300,000			—			—			—			300,000			Payments on long-term debt, capital leases, and associated costs	(4,005		)	(79,839		)	(13,326		)	—			(97,170		)
	CASH FLOWS FROM FINANCING ACTIVITIES:
	Issuance of notes and bank borrowings	153,000			—			14,784			—			167,784			Payments on long-term debt, capital leases, and associated costs	(52,568		)	(3,171		)	(4,889		)	—			(60,628		)	Gold production royalty payments	—			—			(74,734		)	—			(74,734		)
	Payments on long-term debt, capital leases, and associated costs	(18,545		)	(6,114		)	(1,243		)	—			(25,902		)	Gold production royalty payments	—			—			(57,034		)	—			(57,034		)	Share repurchases	(19,971		)	—			—			—			(19,971		)
	Gold production royalty payments	—			—			(48,395		)	—			(48,395		)	Share repurchases	(27,552		)	—			—			—			(27,552		)	Net intercompany financing activity	67,082			86,394			(153,476		)	—			—
	Net intercompany financing activity	(21,697		)	(7,256		)	(20,053		)	49,006			—			Net intercompany financing activity	(22,874		)	40,279			(17,405		)	—			—			Other	(861		)	4,645			—			—			3,784
	Other	(509		)	—			—			—			(509		)	Other	(514		)	—			—			—			(514		)	CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	42,245			11,200			(241,536		)	—			(188,091		)
	CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	112,249			(13,370		)	(54,907		)	49,006			92,978			CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	196,492			37,108			(79,328		)	—			154,272			NET CHANGE IN CASH AND CASH EQUIVALENTS	1,116			(33		)	(50,655		)	—			(49,572		)
	NET CHANGE IN CASH AND CASH EQUIVALENTS	73,285			4,790			(13,904		)	—			64,171			NET CHANGE IN CASH AND CASH EQUIVALENTS	50,288			591			30,371			—			81,250			Cash and cash equivalents at beginning of period	85,672			433			88,907			—			175,012
	Cash and cash equivalents at beginning of period	137,076			991			68,623			—			206,690			Cash and cash equivalents at beginning of period	86,788			400			38,252			—			125,440			Cash and cash equivalents at end of period	$	86,788		$	400		$	38,252		$	—		$	125,440
	Cash and cash equivalents at end of period	$	210,361		$	5,781		$	54,719		$	—		$	270,861		Cash and cash equivalents at end of period	$	137,076		$	991		$	68,623		$	—		$	206,690
Schedule of Condensed Balance Sheet	CONDENSED CONSOLIDATING BALANCE SHEET																CONDENSED CONSOLIDATING BALANCE SHEET
	DECEMBER 31, 2014																DECEMBER 31, 2013
	In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	ASSETS																In thousands	Coeur Mining, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	CURRENT ASSETS																ASSETS
	Cash and cash equivalents	$	210,361		$	5,781		$	54,719		$	—		$	270,861		CURRENT ASSETS
																	Cash and cash equivalents	$	137,076		$	991		$	68,623		$	—		$	206,690
	Receivables	87			11,151			105,683			—			116,921
																	Receivables	530			19,982			60,562			—			81,074
	Ore on leach pads	—			48,204			—			—			48,204
																	Ore on leach pads	—			50,495			—			—			50,495
	Inventory	—			54,983			59,948			—			114,931
																	Inventory	—			35,290			96,733			—			132,023
	Deferred tax assets	393			—			6,971			—			7,364
																	Deferred tax assets	—			—			35,008			—			35,008
	Prepaid expenses and other	6,349			4,557			4,617			—			15,523
																	Prepaid expenses and other	4,128			5,282			16,530			—			25,940
		217,190			124,676			231,938			—			573,804
																		141,734			112,040			277,456			—			531,230
	NON-CURRENT ASSETS
	Property, plant, and equipment, net	6,155			107,084			114,672			—			227,911			NON-CURRENT ASSETS
																	Property, plant, and equipment, net	5,980			143,118			337,175			—			486,273
	Mining properties, net	12,004			159,124			330,064			—			501,192
																	Mining properties, net	—			235,537			1,515,964			—			1,751,501
	Ore on leach pads	—			37,889			—			—			37,889
																	Ore on leach pads	—			31,528			—			—			31,528
	Restricted assets	897			50			6,090			—			7,037
																	Restricted assets	830			50			6,134			—			7,014
	Equity securities	—			5,982			—			—			5,982
																	Equity securities	—			14,521			—			—			14,521
	Receivables	—			—			21,686			—			21,686
																	Receivables	—			—			36,574			—			36,574
	Debt issuance costs, net	9,851			—			—			—			9,851
																	Debt issuance costs, net	10,812			—			—			—			10,812
	Deferred tax assets	30,419			—			29,732			—			60,151
																	Deferred tax assets	955			—			234			—			1,189
	Net investment in subsidiaries	128,913			45,615			—			(174,528		)	—
																	Net investment in subsidiaries	1,242,480			46,215			1,578,799			(2,867,494		)	—
	Other	50,813			5,522			4,394			(50,814		)	9,915
																	Other	53,858			14,616			320,425			(373,563		)	15,336
	TOTAL ASSETS	$	456,242		$	485,942		$	738,576		$	(225,342	)	$	1,455,418
																	TOTAL ASSETS	$	1,456,649		$	597,625		$	4,072,761		$	(3,241,057	)	$	2,885,978
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	CURRENT LIABILITIES																LIABILITIES AND STOCKHOLDERS’ EQUITY
	Accounts payable	$	3,414		$	13,391		$	32,247		$	—		$	49,052		CURRENT LIABILITIES
																	Accounts payable	$	1,963		$	15,864		$	36,020		$	—		$	53,847
	Accrued liabilities and other	22,588			11,207			17,718			—			51,513
																	Accrued liabilities and other	16,693			8,016			14,611			(1,054		)	38,266
	Debt	5,334			7,476			4,688			—			17,498
																	Debt	—			1,262			309,472			(308,229		)	2,505
	Royalty obligations	—			5,747			37,931			—			43,678
																	Royalty obligations	—			3,934			44,085			—			48,019
	Reclamation	—			3,401			1,621			(1,151		)	3,871
																	Reclamation	—			—			794			119			913
	Deferred tax liabilities	7,142			848			88			—			8,078
																	Deferred tax liabilities	—			—			1,011			—			1,011
		38,478			42,070			94,293			(1,151		)	173,690
																		18,656			29,076			405,993			(309,164		)	144,561
	NON-CURRENT LIABILITIES
	Debt	437,455			12,806			61,452			(50,814		)	460,899			NON-CURRENT LIABILITIES
																	Debt	305,335			255			64,820			(64,280		)	306,130
	Royalty obligations	—			9,623			18,028			—			27,651
																	Royalty obligations	—			17,696			47,446			—			65,142
	Reclamation	—			46,792			19,000			1,151			66,943
Reclamation																	—			45,894			11,740			(119		)	57,515
	Deferred tax liabilities	53,201			2,963			54,842			—			111,006
Deferred tax liabilities																	37,095			1,618			517,533			—			556,246
	Other long-term liabilities	2,582			469			26,860			—			29,911
Other long-term liabilities																	2,467			544			22,806			—			25,817
	Intercompany payable (receivable)	(660,792		)	427,156			233,636			—			—
Intercompany payable (receivable)																	(637,471		)	427,085			210,386			—			—
		(167,554		)	499,809			413,818			(49,663		)	696,410
																	(292,574		)	493,092			874,731			(64,399		)	1,010,850
	STOCKHOLDERS’ EQUITY
Common stock	1,034			250			128,299			(128,549		)	1,034			STOCKHOLDERS’ EQUITY
																Common stock	1,028			250			122,666			(122,916		)	1,028
Additional paid-in capital	2,789,695			79,712			1,682,830			(1,762,542		)	2,789,695
																Additional paid-in capital	2,781,164			79,712			3,258,037			(3,337,749		)	2,781,164
Accumulated deficit	(2,202,603		)	(133,091		)	(1,580,664		)	1,713,755			(2,202,603		)
																Accumulated deficit	(1,046,719		)	401			(588,666		)	588,265			(1,046,719		)
Accumulated other comprehensive income (loss)	(2,808		)	(2,808		)	—			2,808			(2,808		)
																Accumulated other comprehensive income (loss)	(4,906		)	(4,906		)	—			4,906			(4,906		)
	585,318			(55,937		)	230,465			(174,528		)	585,318
																	1,730,567			75,457			2,792,037			(2,867,494		)	1,730,567
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	456,242		$	485,942		$	738,576		$	(225,342	)	$	1,455,418
																TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	1,456,649		$	597,625		$	4,072,761		$	(3,241,057	)	$	2,885,978

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2014
Other Significant Noncash Transactions [Line Items]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
		Year ended December 31,
	Non-cash financing and investing activities:	2014	2013	2012
	Capital lease obligations	24,879	—	1,857
	Non-cash acquisitions and related deferred taxes	—	317,826	64,133
	Other cash flow information:
	Interest paid	30,691	14,139	6,092
	Income taxes paid	20,198	26,585	54,680

Summary_of_Significant_Account1

Summary of Significant Accounting Policies Property Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2014
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Long-Lived Assets, Impairment Testing, Commodity, Silver, Price per Ounce	19	25
Long-Lived Assets, Impairment Testing, Commodity, Gold, Price per Ounce	1,275	1,450
Certificates of deposit and cash	$7,000,000	$7,000,000
Write-downs	1,472,721,000	772,993,000	5,825,000
Drilling and Related Costs Capitalized	$8,900,000	$11,600,000

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financial information relating to reporting segments
Total Revenue	$635,742		$745,994		$895,492
Costs applicable to sales	477,945	[1]	463,663	[1]	454,562	[1]
Amortization	162,436		229,564		216,032
Exploration	21,740		22,360		26,270
Write-downs	1,472,721		772,993		5,825
Litigation settlement	0		32,046		0
Other operating expenses
Interest income and other, net	1,375		13,323		15,041
Interest expense, net	-47,546		-41,303		-26,169
Loss on termination of revolving credit facility	0		0		-1,036
Fair value adjustments, net	3,618		82,768		-23,487
Income and mining tax (expense) benefit	459,244		158,116		-70,807
Net income (loss)	-1,155,884		-650,563		48,677
Assets, Net	1,084,257				2,974,056
Capital expenditures	64,244		100,813		115,641
Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales	187,276		188,572		197,478
Amortization	69,431		133,535		145,945
Exploration	6,671		7,161		7,575
Write-downs	784,038		642,094		0
Other operating expenses	620		705		661
Interest income and other, net	131		906		4,017
Interest expense, net	-9,320		-15,123		-18,938
Loss on termination of revolving credit facility					0
Fair value adjustments, net	-1,847		76,218		-31,054
Income and mining tax (expense) benefit	283,685		107,748		-18,066
Net income (loss)	-531,384		-478,278		26,398
Assets, Net	341,367	[2]	1,164,852		1,905,269
Capital expenditures	26,084	[3]	33,730	[3]	38,456	[3]
San Bartolome [Member]
Financial information relating to reporting segments
Metal sales					178,005
Royalties					0
Costs applicable to sales	89,659		86,827		71,428
Amortization	19,423		19,103		16,624
Exploration	120		111		159
Write-downs	118,754		0		0
Other operating expenses	-251		6,205		165
Interest income and other, net	2,461		2,582		9,719
Interest expense, net	-52		-74		-72
Loss on termination of revolving credit facility					0
Fair value adjustments, net	0		0		0
Income and mining tax (expense) benefit	18,114		-10,938		-44,632
Net income (loss)	-89,433		21,045		54,644
Assets, Net	188,616	[2]	289,272		302,922
Capital expenditures	7,937	[3]	11,568	[3]	25,672	[3]
Kensington [Member]
Financial information relating to reporting segments
Metal sales	136,960		148,769		110,987
Royalties	0		0		0
Total Revenue	136,960		148,769		110,987
Costs applicable to sales	105,342		104,575		87,089
Amortization	43,619		62,750		41,241
Exploration	8,005		4,199		3,283
Write-downs	107,832		130,694		0
Other operating expenses	796		735		478
Interest income and other, net	-22		-187		-77
Interest expense, net	-214		-424		-2,972
Loss on termination of revolving credit facility					-1,036
Fair value adjustments, net	0		7,480		4,089
Income and mining tax (expense) benefit	0		-1		0
Net income (loss)	-128,870		-147,316		-21,100
Assets, Net	215,973	[2]	343,144	[2]	508,658
Capital expenditures	16,220	[3]	21,404	[3]	36,994	[3]
Rochester [Member]
Financial information relating to reporting segments
Metal sales	123,768		119,254		132,392
Royalties	0		0		0
Total Revenue	123,768		119,254		132,392
Costs applicable to sales	91,462		77,869		72,061
Amortization	20,790		8,890		6,784
Exploration	2,636		2,653		3,591
Write-downs	0		0		0
Other operating expenses	2,813		36,265		2,682
Interest income and other, net	105		-318		358
Interest expense, net	-679		-20		-26
Loss on termination of revolving credit facility					0
Fair value adjustments, net	3,653		416		0
Income and mining tax (expense) benefit	-2,224		-2,332		-2,195
Net income (loss)	6,922		-8,677		45,411
Assets, Net	196,765	[2]	176,789		104,373
Capital expenditures	11,898	[3]	29,406	[3]	11,794	[3]
La Preciosa [Member]
Financial information relating to reporting segments
Metal sales	0		0
Royalties	0		0
Total Revenue	0		0
Costs applicable to sales	0		0
Amortization	84		24
Exploration	236		80
Write-downs	372,466		0
Other operating expenses	13,961		3,237
Interest income and other, net	-523		15
Interest expense, net	0		0
Fair value adjustments, net	0		0
Income and mining tax (expense) benefit	132,151		-20,856
Net income (loss)	-255,119		-24,182
Assets, Net	39,701	[2]	410,335	[2]
Capital expenditures	255	[3]	1,122	[3]
Coeur Capital [Member]
Financial information relating to reporting segments
Metal sales	10,046		12,871		18,848
Royalties	3,216		0		0
Total Revenue	13,262		12,871		18,848
Costs applicable to sales	4,206		5,820		8,824
Amortization	7,015		3,755		4,632
Exploration	515		2,069		1,056
Write-downs	6,202		0		0
Other operating expenses	938		1,397		-736
Interest income and other, net	-7,141		-19,474		-77
Interest expense, net	-1		0		0
Loss on termination of revolving credit facility					0
Fair value adjustments, net	0		0		0
Income and mining tax (expense) benefit	1,212		2,179		-327
Net income (loss)	-11,544		-17,465		4,668
Assets, Net	59,848	[2]	62,678		32,656
Capital expenditures	0		0		0
Other Mining Properties [Member]
Financial information relating to reporting segments
Metal sales	0		-661		13,162
Royalties	0		0		0
Total Revenue	0		-661		13,162
Costs applicable to sales	0		0		17,682
Amortization	2,074		1,507		806
Exploration	3,557		6,087		10,606
Write-downs	83,429				5,825
Litigation settlement			205
Other operating expenses	48,005		54,029		33,813
Interest income and other, net	-229		11,491		496
Interest expense, net	-37,280		-25,662		-4,161
Loss on termination of revolving credit facility					0
Fair value adjustments, net	1,812		-1,346		3,478
Income and mining tax (expense) benefit	26,306		82,316		-5,587
Net income (loss)	-146,456		4,310		-61,344
Assets, Net	41,987		111,749		120,178
Capital expenditures	1,850		3,583		2,725
Total [Member]
Financial information relating to reporting segments
Metal sales	632,526		745,994		895,492
Royalties	3,216		0		0
Total Revenue			745,994		895,492
Costs applicable to sales			463,663		454,562
Amortization			229,564		216,032
Exploration			22,360		26,270
Write-downs	1,472,721				5,825
Other operating expenses	66,882		102,573		37,063
Interest income and other, net	-5,218		-4,985		14,436
Interest expense, net					26,169
Fair value adjustments, net					-23,487
Net income (loss)			-650,563
Capital expenditures	64,244		100,813		115,641
Bolivia [Member]
Financial information relating to reporting segments
Metal sales	117,749
Royalties	0
Total Revenue	117,749		141,721		178,005
Bolivia [Member] | San Bartolome [Member]
Financial information relating to reporting segments
Metal sales			141,721
Royalties			0
Total Revenue			141,721
Mexico [Member]
Financial information relating to reporting segments
Total Revenue	245,493		324,040		442,098
Mexico [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Metal sales	244,003		324,040		442,098
Royalties	0		0		0
Total Revenue	$244,003		$324,040		$442,098
[1]	Excludes amortization.
[2]	Excludes amortization
[3]	Segment assets include receivables, prepaids, inventories, property, plant, and equipment, and mineral interests

Segment_Reporting_Details_1

Segment Reporting (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Segment Reporting [Abstract]
Assets, Net	$1,084,257			$2,974,056
Cash and cash equivalents	270,861	206,690	206,690	125,440	175,012
Deferred Tax Assets, Net	-51,569	-521,060
Other assets	100,300	120,469
TOTAL ASSETS	$1,455,418	$2,885,978

Segment_Reporting_Details_2

Segment Reporting (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long Lived Assets
Entity Wide Disclosure on Geographic Areas Long Lived Assets in Entity's Country of Domicile and Foreign Countries	$729,103	$2,237,774
Revenues
Total Revenue	635,742	745,994	895,492
United States [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	275,594	384,626
Revenues
Total Revenue	260,728	268,023	243,379
Australia [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	21,362	25,668
Revenues
Total Revenue	10,046	12,871	18,848
Argentina [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	10,970	94,705
Bolivia [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	107,960	235,085
Revenues
Total Revenue	117,749	141,721	178,005
Mexico [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	298,101	1,487,228
Revenues
Total Revenue	245,493	324,040	442,098
Other Foreign Countries [Member]
Long Lived Assets
Long Lived Assets in Entity's Country of Domicile	15,116	10,462
Revenues
Total Revenue	1,726	-661	13,162
Operating Segments [Member]
Revenues
Total Revenue		$745,994	$895,492

Segment_Reporting_Revenue_by_C

Segment Reporting Revenue by Customer (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Mitsui [Member] | Palmarejo, Rochester [Member]
Revenue, Major Customer [Line Items]
Revenues	$133.80	$70.30	$65.60
TD Bank Group [Member] | Palmarejo, Rochester [Member]
Revenue, Major Customer [Line Items]
Revenues	106.7	106.7	65.8
Standard Bank [Member] | Palmarejo, Rochester [Member]
Revenue, Major Customer [Line Items]
Revenues	87.5	69	72.3
China Gold [Member] | Kensington [Member]
Revenue, Major Customer [Line Items]
Revenues	86.8	81.5	43.8
Johnson Matthey [Member] | San Bartolome [Member]
Revenue, Major Customer [Line Items]
Revenues	71.8	66.4	1.7
Valcambi [Member] | Palmarejo San Bartolome [Member]
Revenue, Major Customer [Line Items]
Revenues	33.9	77.2	414.4
International Commodities [Member] | Palmarejo San Bartolome Rochester [Member]
Revenue, Major Customer [Line Items]
Revenues	22.4	84.6	58
Auramet [Member] | Palmarejo, San Bartolome, Kensington, Rochester [Member]
Revenue, Major Customer [Line Items]
Revenues	$10.80	$111.70	$94.60

Segment_Reporting_Narrative_De

Segment Reporting Narrative (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	$635,742	$745,994	$895,492
Silver [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	328,500	394,500	549,700
Gold [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	$304,000	$351,500	$345,800
Dore [Member]
Segment Reporting Information [Line Items]
Number of Trading Counterparties	7
Smelting and Refining [Member]
Segment Reporting Information [Line Items]
Number of Trading Counterparties	7
Sales [Member] | Dore [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	63.00%	72.00%	91.00%
Sales [Member] | Smelting and Refining [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	37.00%	28.00%	9.00%

WriteDowns_Details

Write-Downs (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Entity Location [Line Items]
Write-downs	$1,472,721	$772,993	$5,825
Property, Plant and Equipment, Other Types [Member]
Entity Location [Line Items]
Write-downs	242,877	151,092	0
Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	1,229,844	621,901	5,825
Martha [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	0	205	5,825
Couer Capital (El Gallo) [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	6,202	0	0
Joaquin Project - Argentina [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	83,429	0	0
La Preciosa [Member]
Entity Location [Line Items]
Write-downs	372,500
La Preciosa [Member] | Property, Plant and Equipment, Other Types [Member]
Entity Location [Line Items]
Write-downs	1,055	0	0
La Preciosa [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	371,411	0	0
Kensington [Member]
Entity Location [Line Items]
Write-downs		130,700
Kensington [Member] | Property, Plant and Equipment, Other Types [Member]
Entity Location [Line Items]
Write-downs	40,161	48,357	0
Kensington [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	67,671	82,337	0
San Bartolome [Member] | Property, Plant and Equipment, Other Types [Member]
Entity Location [Line Items]
Write-downs	86,426	0	0
San Bartolome [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	32,328	0	0
Palmarejo [Member]
Entity Location [Line Items]
Write-downs	784,000	642,100
Palmarejo [Member] | Property, Plant and Equipment, Other Types [Member]
Entity Location [Line Items]
Write-downs	115,235	102,735	0
Palmarejo [Member] | Other Mining Properties [Member]
Entity Location [Line Items]
Write-downs	$668,803	$539,359	$0

WriteDowns_Narrative_Details

Write-Downs Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	$1,472,721,000	$772,993,000	$5,825,000
Write-downs, net of tax	1,021,800,000	593,200,000
Palmarejo [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	784,000,000	642,100,000
Write-downs, net of tax	504,500,000	462,300,000
La Preciosa [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	372,500,000
Write-downs, net of tax	$244,900,000

Reclamation_Details

Reclamation (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Asset retirement obligation
Asset retirement obligation - Beginning	$55,966,000	$55,966,000	$33,008,000	$55,966,000
Accretion	4,826,000	3,316,000
Additions and changes in estimates		6,748,000	19,670,000
Settlements	-326,000	-28,000
Asset retirement obligation - Ending		67,214,000	55,966,000	55,966,000
Reclamation and Mine Closure (Textual) [Abstract]
Accrued reclamation liabilities		$3,600,000	$2,500,000

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of stock options granted	$3.79	$12.60	$15.77
Volatility	50.93%	76.74%	70.56%
Expected life in years	3 years 11 months	5 years 0 months	5 years 6 months
Risk-free interest rate	1.25%	0.84%	0.89%
Dividend yield	0.00%	0.00%	0.00%

StockBased_Compensation_Detail1

Stock-Based Compensation (Details 1) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance	415,570	370,000	321,607
Granted	415,172	190,452	151,102
Exercised		-13,027	-40,173
Canceled/forfeited	-232,396	-131,855	-62,536
Ending balance	598,346	415,570	370,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Beginning Balance	$27.36	$30.20	$24.60
Weighted Average Grant Date Fair Value, Granted	$9.45	$20.41	$26.97
Weighted Average Grant Date Fair Value, Exercised		$10.77	$11.84
Weighted Average Grant Date Fair Value, Canceled/forfeited	$23.94	$29.30	$29.22
Weighted Average Exercise Price, Ending Balance	$16.26	$27.36	$30.20
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance, SARs	50,209	68,865	107,639
Granted, SARs	0	0	0
Exercised, SARs		-6,617	-34,385
Canceled/forfeited, SARs	-3,637	-12,039	-4,389
Ending balance, SARs	46,572	50,209	68,865
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$14.15	$13.83	$13.46
Weighted Average Grant Date Fair Value, Granted	$0	$0	$0
Period Weighted Average Grant Date Fair Value, Granted		$13.14	$12.73
Weighted Average Grant Date Fair Value, Canceled/forfeited	$15.40	$15.40	$15.40
Weighted Average Exercise Price, Ending Balance	$14.06	$14.15	$13.83

StockBased_Compensation_Detail2

Stock-Based Compensation (Details 2) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	598,346
Weighted Average Exercise Price	$16.26
Number Exercisable	167,389
Weighted Average Exercise Price	$24.93
$ 0.00-$10.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	284,866
Weighted Average Exercise Price	$9.34
Weighted Average Remaining Contractual Life	9 years 0 months 15 days
Number Exercisable	11,034
Weighted Average Exercise Price	$10
Weighted Average Remaining Contractual Life	4 years 1 month 2 days
$10.00-$20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	121,540
Weighted Average Exercise Price	$15.51
Weighted Average Remaining Contractual Life	8 years 5 months 5 days
Number Exercisable	33,646
Weighted Average Exercise Price	$17.33
Weighted Average Remaining Contractual Life	8 years 1 month 8 days
$20.00-$30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	176,777
Weighted Average Exercise Price	$25.68
Weighted Average Remaining Contractual Life	6 years 10 months 17 days
Number Exercisable	107,546
Weighted Average Exercise Price	$26.37
Weighted Average Remaining Contractual Life	6 years 3 months 7 days
$30.00-$40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	9,566
Weighted Average Exercise Price	$38.25
Weighted Average Remaining Contractual Life	2 years 5 months 9 days
Number Exercisable	9,566
Weighted Average Exercise Price	$38.25
Weighted Average Remaining Contractual Life	2 years 5 months 9 days
$40.00-$50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	3,336
Weighted Average Exercise Price	$48.50
Weighted Average Remaining Contractual Life	3 years 0 months 11 days
Number Exercisable	3,336
Weighted Average Exercise Price	$48.50
Weighted Average Remaining Contractual Life	3 years 0 months 11 days
$50.00-$60.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	2,261
Weighted Average Exercise Price	$51.40
Weighted Average Remaining Contractual Life	1 year 1 month 21 days
Number Exercisable	2,261
Weighted Average Exercise Price	$51.40
Weighted Average Remaining Contractual Life	1 year 1 month 21 days

StockBased_Compensation_Detail3

Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	613,086	239,698	173,509
Granted	695,897	573,467	230,096
Vested	-234,103	-90,963	-95,336
Cancelled/Forfeited	-172,881	-109,116	-68,571
Ending Balance	901,999	613,086	239,698
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Fair Value	$16.68	$25.38	$11.37
Granted, Weighted Average Fair Value	$9.83	$15.38	$26.40
Vested, Weighted Average Fair Value	$17.16	$26.83	$23.15
Cancelled/Forfeited, Weighted Average Fair Value	$11.87	$23.30	$27.43
Ending Balance, Weighted Average Fair Value	$12.19	$16.68	$25.38
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	0	11,411	45,518
Granted	0	0	0
Vested	0	-11,411	-31,456
Cancelled/Forfeited	0	0	-2,651
Ending Balance	0	0	11,411
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Fair Value	$0	$24.14	$27.32
Granted, Weighted Average Fair Value	$0	$0	$0
Vested, Weighted Average Fair Value	$0	$22.74	$25.92
Cancelled/Forfeited, Weighted Average Fair Value	$0	$0	$24.60
Ending Balance, Weighted Average Fair Value	$0	$0	$24.14
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	210,395,000	109,159,000	105,929,000
Granted	358,398,000	173,773,000	145,508,000
Vested	-34,611,000	-4,160,000	-111,703,000
Cancelled/Forfeited	-17,352,000	-68,377,000	-30,575,000
Ending Balance	516,830,000	210,395,000	109,159,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Fair Value	$28.04	$26.92	$16.29
Granted, Weighted Average Fair Value	$12.21	$23.35	$25.78
Vested, Weighted Average Fair Value	$27.18	$30.97	$7.96
Cancelled/Forfeited, Weighted Average Fair Value	$27.15	$34.49	$42.11
Ending Balance, Weighted Average Fair Value	$17.61	$28.04	$26.92
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	0	34,239,000	84,539,000
Granted	0	34,239,000	32,498,000
Vested	0	-68,478,000	-74,845,000
Cancelled/Forfeited	0	0	-7,953,000
Ending Balance	0	0	34,239,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Fair Value	$0	$39.78	$35.41
Granted, Weighted Average Fair Value	$0	$38.02	$0
Vested, Weighted Average Fair Value	$0	$38.02	$31.17
Cancelled/Forfeited, Weighted Average Fair Value	$0	$0	$49.20
Ending Balance, Weighted Average Fair Value	$0	$0	$39.78

StockBased_Compensation_Detail4

Stock-Based Compensation (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation cost	$8.70
Unrecognized stock-based compensation cost, weighted-average period recognized	1 year 6 months 20 days
Maximum Bonus, Supplemental Incentive	3.8
Maximum Bonus, Supplemental Incentive, Discretionary Cash or Stock	2.8
Supplemental Incentive Plan, Currently Accrued	0.6
Annual Incentive Plan and Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for stock based compensation awards	9.3	4.8	8
Stock Options and Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation cost	0.7
Unrecognized stock-based compensation cost, weighted-average period recognized	1 year 3 months 18 days
Restricted Stock and Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation cost	3.4
Unrecognized stock-based compensation cost, weighted-average period recognized	1 year 4 months 24 days
Performance Shares and Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation cost	$2.90
Unrecognized stock-based compensation cost, weighted-average period recognized	1 year 10 months 6 days

Retirement_Savings_Plan_Detail

Retirement Savings Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Postemployment Benefits [Abstract]
Percentage of employee compensation plus matching contribution	100.00%
Percentage of maximum limit for employees to contribute their cash compensation	75.00%
Percentage of employee contribution	4.00%
Total plan expenses	$2.60	$4.10	$4.10

Income_and_Mining_Taxes_Detail

Income and Mining Taxes (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	($213,883)	($242,562)	($3,443)
Foreign	-1,401,245	-566,117	122,927
Total	($1,615,128)	($808,679)	$119,484

Income_and_Mining_Taxes_Detail1

Income and Mining Taxes (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income and mining tax (expense) benefit	$459,244	$158,116	($70,807)
United States - Alternative minimum tax [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal tax expense (benefit)	904	4	-257
United States - State Mining Taxes [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal tax expense (benefit)	-879	-714	-2,195
United States - Foreign Withholding [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal tax expense (benefit)	-6,250	397	-736
Argentina [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	-71	-137	976
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	24,478	8,062	0
Australia [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	0	-914	-1,760
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	-401	-2	-223
Mexico [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	-1,124	-9,046	-7,814
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	417,068	94,851	-10,579
Bolivia [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	-4,008	-6,716	-43,546
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	22,122	-4,222	-1,087
Canada [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	-145	-1,936	0
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	1,807	0	0
United States [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred federal (expense) benefit	$5,743	$78,489	($3,586)

Income_and_Mining_Taxes_Detail2

Income and Mining Taxes (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax benefit (expense) from continuing operations	$565,295	$283,038	($41,819)
State tax provision from continuing operations	20,253	2,245	-3,151
Percentage depletion and related deductions	0	0	7,461
Change in valuation allowance	-128,344	-106,802	-12,651
Non-deductible imputed interest	0	-214	-525
Uncertain tax positions	-4,425	-5,209	-9,849
U.S. and foreign non-deductible expenses	-4,892	-2,383	-4,206
Foreign exchange rates	23,672	13,937	-10,416
Foreign inflation and indexing	3,765	2,937	712
Foreign tax rate differences	-63,930	-24,108	3,967
Foreign withholding and other foreign taxes	91,882	-100,331	-5,861
Foreign tax credits and other, net	-44,032	13,153	5,531
Change in Mexico permanent reinvestment assertion	0	81,853	0
Income and mining tax (expense) benefit	$459,244	$158,116	($70,807)

Income_and_Mining_Taxes_Detail3

Income and Mining Taxes (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax liabilities:
Mineral properties	$0	$344,152
Mexican mining royalty tax	7,586	76,386
Foreign subsidiaries b unremitted earnings	45,249	182,464
Inventory	1,100	2,746
Property, plant, and equipment, net	0	33,094
Deferred Tax Liabilities, Net	53,935	638,842
Deferred tax assets:
Net operating loss carryforwards	153,689	130,170
Deferred Tax Assets Mineral Properties	70,510	0
Deferred Tax Assets, Property, Plant and Equipment	46,042	0
Foreign subsidiaries b future tax credits	0	163,947
Royalty and other long-term debt	5,863	11,616
Capital loss carryforwards	35,251	34,930
Asset retirement obligation	21,586	18,589
Unrealized foreign currency loss and other	8,213	9,567
Accrued expenses	14,773	14,756
Tax credit carryforwards	56,322	23,585
Deferred Tax Assets, Gross	412,249	407,160
Valuation allowance	-409,883	-289,378
Deferred Tax Assets, Net of Valuation Allowance	2,366	117,782
Net deferred tax liabilities	($51,569)	($521,060)

Income_and_Mining_Taxes_Detail4

Income and Mining Taxes (Details 5) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Examination [Line Items]
Valuation allowance	$409,883	$289,378
United States [Member]
Income Tax Examination [Line Items]
Valuation allowance	305,534	236,653
Argentina [Member]
Income Tax Examination [Line Items]
Valuation allowance	21,520	17,005
Canada [Member]
Income Tax Examination [Line Items]
Valuation allowance	2,009	4,453
Bolivia [Member]
Income Tax Examination [Line Items]
Valuation allowance	15,948	0
Mexico [Member]
Income Tax Examination [Line Items]
Valuation allowance	33,189	0
New Zealand [Members]
Income Tax Examination [Line Items]
Valuation allowance	28,710	27,292
Other [Member]
Income Tax Examination [Line Items]
Valuation allowance	$2,973	$3,975

Income_and_Mining_Taxes_Detail5

Income and Mining Taxes (Details 6) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning of the period	$15,471	$10,511
Gross increase to current period tax positions	1,856	2,231
Gross increase to prior period tax positions	524	2,761
Reductions in unrecognized tax benefits resulting from a lapse of the applicable statue of limitations	-1,767	-32
Unrecognized tax benefits, end of period	$16,084	$15,471

Income_and_Mining_Taxes_Detail6

Income and Mining Taxes (Details 7) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Loss Carryforwards [Line Items]
Regular net operating losses	$439,138
Alternative minimum tax net operating losses	117,362
Capital losses	91,019
Alternative minimum tax credits	4,142
Foreign tax credits	52,181
United States [Member]
Operating Loss Carryforwards [Line Items]
Regular net operating losses	245,683
Alternative minimum tax net operating losses	117,362
Capital losses	91,019
Alternative minimum tax credits	4,142
Foreign tax credits	52,181
Argentina [Member]
Operating Loss Carryforwards [Line Items]
Regular net operating losses	16,588
Alternative minimum tax net operating losses	0
Capital losses	0
Alternative minimum tax credits	0
Foreign tax credits	0
Canada [Member]
Operating Loss Carryforwards [Line Items]
Regular net operating losses	1,633
Alternative minimum tax net operating losses	0
Capital losses	0
Alternative minimum tax credits	0
Foreign tax credits	0
Mexico [Member]
Operating Loss Carryforwards [Line Items]
Regular net operating losses	49,747
Alternative minimum tax net operating losses	0
Capital losses	0
Alternative minimum tax credits	0
Foreign tax credits	0
New Zealand [Members]
Operating Loss Carryforwards [Line Items]
Regular net operating losses	102,535
Alternative minimum tax net operating losses	0
Capital losses	0
Alternative minimum tax credits	0
Foreign tax credits	0
Other [Member]
Operating Loss Carryforwards [Line Items]
Regular net operating losses	22,952
Alternative minimum tax net operating losses	0
Capital losses	0
Alternative minimum tax credits	0
Foreign tax credits	$0

Income_and_Mining_Taxes_Detail7

Income and Mining Taxes (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
Unrecognized tax benefit that would impact effective tax rate	16.1	14.3	10.3
Penalties and interest expense	$2.90	$4.10	$2.50
Cumulative Amount of Temporary Differences Related to Investments in Foreign Subsidiaries		$81

Net_Income_Loss_Per_Share_Deta

Net Income (Loss) Per Share (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss) per share, basic
Net income (loss) available to common stockholders	($1,155,884)	($650,563)	$48,677
Weighted average shares
Basic (in shares)	102,441,000	97,864,000	89,437,000
Effect of share based compensation plans (in shares)	0	0	166,000
Diluted (in shares)	102,441,000	97,864,000	89,603,000
Income (loss) per share
Basic (in dollars per share)	($11.28)	($6.65)	$0.54
Diluted (in dollars per share)	($11.28)	($6.65)	$0.54
Convertible Senior Notes Due March 2028 [Member]
Earnings Per Share (Textual) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of shares of common stock equivalents related to convertible debt	1,871,681	1,111,021	479,767

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	12 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments	$3,618	$82,768	($23,487)
Assets, Fair Value Disclosure	10,002	14,656
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39,126	63,559
Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments		76,200	-31,053	-2,001
Derivative Liability, Fair Value, Gross Liability		40,338
Rochester Royalty Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments		416	0	3,653
Derivative Liability, Fair Value, Gross Liability		21,630
Silver and gold options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments	1,058	7,119	4,302
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments	-16	-985	3,264
Foreign Exchange Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments		-967	3,264	908
Other Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	805	1,591
Operating Segments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative instruments			-23,487
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	138	14,521
Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Investments, at Fair Value	5,982	135
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	4,741	14,521
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] | Rochester Royalty Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability		0
Fair Value, Inputs, Level 1 [Member] | Other Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	138	14,521
Fair Value, Inputs, Level 1 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Investments, at Fair Value	4,603	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	3,882	135
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,844	1,591
Fair Value, Inputs, Level 2 [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 2 [Member] | Rochester Royalty Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability		0
Fair Value, Inputs, Level 2 [Member] | Other Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	805	1,591
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Investments, at Fair Value	0	135
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	1,379	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	37,282	61,968
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	21,912	40,338
Fair Value, Inputs, Level 3 [Member] | Rochester Royalty Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability		21,630
Fair Value, Inputs, Level 3 [Member] | Other Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Investments, at Fair Value	$1,379	$0

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jan. 29, 2013
In Thousands, unless otherwise specified
Assets:
Assets, Fair Value Disclosure	10,002	14,656
Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39,126	63,559
Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		40,338
Rochester Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		21,630
Other Derivative Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	805	1,591
Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	3,882
Liabilities:
Derivative Liability, Fair Value, Gross Liability	1,039
Short-term Deposit [Member]
Assets:
Short-term Deposits	138	14,521
Equity securities [Member]
Assets:
Restricted certificates of deposits	5,982	135
Fair Value, Inputs, Level 1 [Member]
Assets:
Assets, Fair Value Disclosure	4,741	14,521
Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0
Fair Value, Inputs, Level 1 [Member] | Rochester Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		0
Fair Value, Inputs, Level 1 [Member] | Other Derivative Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 1 [Member] | Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	0
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0
Fair Value, Inputs, Level 1 [Member] | Short-term Deposit [Member]
Assets:
Short-term Deposits	138	14,521
Fair Value, Inputs, Level 1 [Member] | Equity securities [Member]
Assets:
Restricted certificates of deposits	4,603	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Assets, Fair Value Disclosure	3,882	135
Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,844	1,591
Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 2 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0
Fair Value, Inputs, Level 2 [Member] | Rochester Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		0
Fair Value, Inputs, Level 2 [Member] | Other Derivative Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	805	1,591
Fair Value, Inputs, Level 2 [Member] | Gold Put Purchase and Call Sold Options Net [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	1,039
Fair Value, Inputs, Level 2 [Member] | Short-term Deposit [Member]
Assets:
Short-term Deposits	0	0
Fair Value, Inputs, Level 2 [Member] | Equity securities [Member]
Assets:
Restricted certificates of deposits	0	135
Fair Value, Inputs, Level 3 [Member]
Assets:
Assets, Fair Value Disclosure	1,379	0
Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	37,282	61,968
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	21,912	40,338
Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	15,370
Fair Value, Inputs, Level 3 [Member] | Rochester Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		21,630
Fair Value, Inputs, Level 3 [Member] | Other Derivative Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0	0
Fair Value, Inputs, Level 3 [Member] | Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	0
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0
Fair Value, Inputs, Level 3 [Member] | Short-term Deposit [Member]
Assets:
Short-term Deposits	0	0
Fair Value, Inputs, Level 3 [Member] | Equity securities [Member]
Assets:
Restricted certificates of deposits	1,379	0
Prepaid Expenses and Other Current Assets [Member]
Assets:
Fair value of derivative asset	3,925	184
Prepaid Expenses and Other Current Assets [Member] | Gold Put Purchase and Call Sold Options Net [Member]
Assets:
Fair value of derivative asset	3,882	135
Palmarejo royalty obligation [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	21,912
Rochester Royalty Obligation [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	15,370
Reported Value Measurement [Member] | Palmarejo gold production royalty [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	34,047	51,193
Portion at Other than Fair Value Measurement [Member] | Palmarejo gold production royalty [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	38,290	65,212
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Palmarejo gold production royalty [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0	0
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Palmarejo gold production royalty [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0	0
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Palmarejo gold production royalty [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	38,290	65,212
Convertible Senior Notes Due March 2028 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%
Convertible Senior Notes Due March 2028 [Member] | Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Line of Credit	14,785
Convertible Debt, Fair Value Disclosures	5,334	5,334
Convertible Senior Notes Due March 2028 [Member] | Portion at Other than Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Line of Credit	14,785
Convertible Debt, Fair Value Disclosures	4,979	5,067
Convertible Senior Notes Due March 2028 [Member] | Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Line of Credit	0
Convertible Debt, Fair Value Disclosures	0	5,067
Convertible Senior Notes Due March 2028 [Member] | Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Line of Credit	14,785
Convertible Debt, Fair Value Disclosures	4,979	0
Convertible Senior Notes Due March 2028 [Member] | Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Line of Credit	0
Convertible Debt, Fair Value Disclosures	0	0
Senior Notes due Two Thousand Twenty One [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.88%	7.88%	7.88%

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Palmarejo royalty obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	$0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	40,338	0
Revaluation	2,001	-76,200
Settlements	-20,427	-28,560
Balance at the end of the period	21,912	40,338
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	0	145,098
Rochester Royalty Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		22,046
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	21,630	0
Revaluation	-3,653	-416
Settlements	-2,607	0
Balance at the end of the period	15,370	21,630
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	0	0
Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	69
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	0
Revaluation	-55
Settlements	0
Balance at the end of the period	1,379
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	$1,365

Fair_Value_Measurements_Detail3

Fair Value Measurements (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Long-Lived Assets, Impairment Testing, Commodity, Silver, Price per Ounce	19	25
Long-Lived Assets, Impairment Testing, Commodity, Gold, Price per Ounce	1,275	1,450
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	8.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	10.75%
Property, Plant and Equipment, Other Types [Member] | Minimum [Member] | Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	8.00%	8.50%
Property, Plant and Equipment, Other Types [Member] | Maximum [Member] | Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	10.75%	10.50%
Mining Properties [Member] | Minimum [Member] | Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	8.00%	8.50%
Mining Properties [Member] | Maximum [Member] | Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	10.75%	10.50%
Other Derivative Instrument [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative Liability, Fair Value	$805	$1,591
Other Derivative Instrument [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative Liability, Fair Value	$0	$0

Fair_Value_Measurements_Detail4

Fair Value Measurements (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$460,899	$306,130
Senior Notes due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	437,454	300,000
Portion at Other than Fair Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	4,979	5,067
Portion at Other than Fair Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	0	5,067
Portion at Other than Fair Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	4,979	0
Portion at Other than Fair Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	0	0
Portion at Other than Fair Value Measurement [Member] | Senior Notes due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	343,305	307,314
Portion at Other than Fair Value Measurement [Member] | Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	0	307,314
Portion at Other than Fair Value Measurement [Member] | Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	343,305	0
Portion at Other than Fair Value Measurement [Member] | Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	0	0
Portion at Other than Fair Value Measurement [Member] | Palmarejo gold production royalty [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	38,290	65,212
Portion at Other than Fair Value Measurement [Member] | Palmarejo gold production royalty [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	0	0
Portion at Other than Fair Value Measurement [Member] | Palmarejo gold production royalty [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	0	0
Portion at Other than Fair Value Measurement [Member] | Palmarejo gold production royalty [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	38,290	65,212
Reported Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	5,334	5,334
Reported Value Measurement [Member] | Senior Notes due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt		300,000
Reported Value Measurement [Member] | Palmarejo gold production royalty [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	$34,047	$51,193

Fair_Value_Measurements_Detail5

Fair Value Measurements (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 29, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Long-Lived Assets Held-for-use	$1,472,721,000	$772,993,000	$5,825,000
Write-downs, net of tax	$1,021,800,000	$593,200,000
Convertible Senior Notes Due March 2028 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%
Senior Notes due 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.88%	7.88%		7.88%
Palmarejo [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected Royalty Duration	1.7
Rochester [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected Royalty Duration	3.2

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2014

USD ($)

USD ($)

USD ($)

Palmarejo gold production royalty [Member]

Palmarejo gold production royalty [Member]

Palmarejo gold production royalty [Member]

Silver concentrate sales agreements [Member]

Silver concentrate sales agreements [Member]

Silver concentrate sales agreements [Member]

Gold concentrates sales agreements [Member]

Gold concentrates sales agreements [Member]

Gold concentrates sales agreements [Member]

Gold put options purchased [Member]

Gold put options purchased [Member]

Gold put options purchased [Member]

Gold Put Option [Member]

Gold Put Option [Member]

Gold Put Option [Member]

Silver put options purchased [Member]

Silver put options purchased [Member]

Silver put options purchased [Member]

Silver Put Options Sold [Member]

Silver Put Options Sold [Member]

Silver Put Options Sold [Member]

Forward foreign exchange contracts [Member]

Forward foreign exchange contracts [Member]

Line of Credit [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

2013 [Member]

2014 [Member]

Thereafter [Member]

Mexican peso forward purchase contracts [Member]

Mexican peso forward purchase contracts [Member]

Gold put options purchased [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

MXN

2013 [Member]

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

Derivative [Line Items]

Gain (loss) on derivative instruments

$3,618,000

$82,768,000

($23,487,000)

Derivative instruments Settlement

Derivative, notional amount

41,981,000

23,779,000

0

10,392,000

0

0

35,576,000

0

0

14,400,000

0

0

12,600,000

0

0

11,250,000

0

0

10,000,000

0

0

45,000,000

Derivative average gold price in excess of minimum contractual Deduction Rate

408

775

774

0

Notional ounces

54,171

30,744

0

0

0

0

0

12,000

0

0

625,000

0

0

Foreign exchange contracts of MXP

$12,000,000

Average rate (MXP/$)

14.8

Derivative average price

16.35

0

0

1,221

0

0

Outstanding Provisionally Priced Sales Consists of Gold

29,137

Outstanding Provisionally Priced Sales Consists of Silver

635,614

Average strike price

0

0

1,050

0

0

18

0

0

16

0

0

1,200

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Prepaid expenses and other [Member]
Fair value of the derivative instruments
Fair value of derivative asset	$3,925,000	$184,000
Accrued liabilities and other [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	1,887,000	1,640,000
Current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	14,405,000	17,650,000
Non-current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	7,507,000	22,688,000
Forward foreign exchange contracts [Member] | Prepaid expenses and other [Member]
Fair value of the derivative instruments
Fair value of derivative asset		38,000
Forward foreign exchange contracts [Member] | Accrued liabilities and other [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value		947,000
Palmarejo gold production royalty [Member] | Current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	14,405,000	17,650,000
Palmarejo gold production royalty [Member] | Non-current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	7,507,000	22,688,000
Put and call options, net [Member]
Fair value of the derivative instruments
Fair value of derivative asset	3,882,000
Derivative Liability, Fair Value	1,039,000
Put and call options, net [Member] | Prepaid expenses and other [Member]
Fair value of the derivative instruments
Fair value of derivative asset	3,882,000	135,000
Put and call options, net [Member] | Accrued liabilities and other [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	1,039,000
Put and call options, net [Member] | Current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value
Put and call options, net [Member] | Non-current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value
Concentrate sales contracts [Member] | Prepaid expenses and other [Member]
Fair value of the derivative instruments
Fair value of derivative asset	43,000	11,000
Concentrate sales contracts [Member] | Accrued liabilities and other [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value	848,000	693,000
Concentrate sales contracts [Member] | Current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value
Concentrate sales contracts [Member] | Non-current portion of royalty obligation [Member]
Fair value of the derivative instruments
Derivative Liability, Fair Value
Mexican peso forward purchase contracts [Member] | Forward foreign exchange contracts [Member]
Derivative [Line Items]
Foreign exchange contracts of MXP		$12,000,000

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net	$3,618	$82,768	($23,487)
Mark-to-market gains or losses on derivatives	-158	80,928	-23,426
Concentrate Sales Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	-123	-1,995	1,682
Forward foreign exchange contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Costs applicable to sales	924	589	1,621
Fair value adjustments, net	-16	-985	3,264
Palmarejo gold production royalty [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net	-2,001	76,200	-31,053
Silver and gold options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net	$1,058	$7,119	$4,302

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Details Textual)

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Jan. 21, 2009

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

USD ($)

Put Option [Member]

Franco-Nevada warrant [Member]

Franco-Nevada warrant [Member]

Franco-Nevada warrant [Member]

Palmarejo gold production royalty [Member]

Palmarejo gold production royalty [Member]

Forward foreign exchange contracts [Member]

Forward foreign exchange contracts [Member]

Forward foreign exchange contracts [Member]

Forward foreign exchange contracts [Member]

Concentrate Sales Contracts [Member]

Concentrate Sales Contracts [Member]

Concentrate Sales Contracts [Member]

Gold Put Purchase and Call Sold Options Net [Member]

Silver and gold options [Member]

Silver and gold options [Member]

Silver and gold options [Member]

Kensington Term Facility [Member]

Kensington Term Facility [Member]

Kensington Term Facility [Member]

Maximum [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Instruments Settle in Year One [Member]

Derivative Financial Instruments, Assets [Member]

Derivative Financial Instruments, Assets [Member]

Derivative Instruments Settle in Year Two [Member]

Derivative Instruments Settle in Year Two [Member]

Derivative Instruments Settle in Year Two [Member]

Derivative Instruments Settle in Year Two [Member]

Derivative Instruments Settle in Year Two [Member]

Derivative Instruments Settle in Year Two [Member]

Derivative Instruments Settle Thereafter [Member]

Derivative Instruments Settle Thereafter [Member]

Derivative Instruments Settle Thereafter [Member]

Derivative Instruments Settle Thereafter [Member]

Derivative Instruments Settle Thereafter [Member]

Derivative Instruments Settle Thereafter [Member]

Prepaid Expenses and Other Current Assets [Member]

Prepaid Expenses and Other Current Assets [Member]

Prepaid Expenses and Other Current Assets [Member]

Prepaid Expenses and Other Current Assets [Member]

Prepaid Expenses and Other Current Assets [Member]

oz

USD ($)

USD ($)

USD ($)

oz

Mexican peso forward purchase contracts [Member]

Mexican peso forward purchase contracts [Member]

Mexican peso forward purchase contracts [Member]

Mexican peso forward purchase contracts [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Put Option [Member]

Gold Put Option [Member]

Put Option on Silver [Member]

Palmarejo gold production royalty [Member]

Gold Put Option [Member]

Silver concentrate sales agreements [Member]

Gold concentrates sales agreements [Member]

Gold put options purchased [Member]

Silver put options purchased [Member]

Silver Put Options Sold [Member]

Kensington Term Facility [Member]

Kensington Term Facility [Member]

Kensington Term Facility [Member]

Gold put options purchased [Member]

Silver put options purchased [Member]

Gold Put Option [Member]

Silver concentrate sales agreements [Member]

Gold concentrates sales agreements [Member]

Gold put options purchased [Member]

Silver put options purchased [Member]

Silver Put Options Sold [Member]

Gold Put Option [Member]

Silver concentrate sales agreements [Member]

Gold concentrates sales agreements [Member]

Gold put options purchased [Member]

Silver put options purchased [Member]

Silver Put Options Sold [Member]

USD ($)

USD ($)

Forward foreign exchange contracts [Member]

Gold Put Purchase and Call Sold Options Net [Member]

Gold Put Purchase and Call Sold Options Net [Member]

USD ($)

USD ($)

USD ($)

MXN

oz

Put Option [Member]

Put Option [Member]

oz

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Gold put options purchased [Member]

Gold put options purchased [Member]

Silver put options purchased [Member]

oz

oz

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

oz

oz

oz

oz

oz

oz

Put Option [Member]

Put Option [Member]

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

oz

USD ($)

USD ($)

Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]

Life of Mine Production, Percentage

50.00%

Fair Value, Asian Put Options

$2,800,000

$100,000

Payment made for gold on the end of royalty obligation

4,167

Royalty Guarantees, Commitments, Ounces of Gold

315,085

400,000

Total gold remain outstanding

35,500,000

84,915

Fair Value Assumptions, Risk Free Interest Rate

11.80%

5.70%

Fair value liability of the embedded derivative

40,300,000

Company recognized Mark to Market loss

18,400,000

14,300,000

Company recognized Mark to Market gain

104,800,000

Percentage of Gold Production

50.00%

Derivative Average Gold Price in Excess of Minimum Contractual Deduction Rate

408

Annual Inflation Compounding Adjustment

1.00%

Realized losses

-20,400,000

-28,600,000

45,400,000

-600,000

0

0

Foreign exchange contracts of MXP

12,000,000

Weighted average exchange rate

12.21

Weighted average exchange rate of MXP

14.8

Fair value of foreign exchange contracts

0

900

Derivative, Average Exchange Rate Floor

12.6

Derivative, Notional Amount

-45,000,000

-12,600,000

-10,392,000

-35,576,000

-14,400,000

-11,250,000

-10,000,000

0

0

0

0

0

0

0

0

0

0

0

0

Mark-to-market gains and (losses) on forward foreign exchange contract

900,000

-600,000

-1,600,000

Derivative Liability, Fair Value

1,039,000

Weighted Average Call Feature of Each Collar

18

Weighted Average Put Feature of Each Collar

1,200

Contract expiration date

3 years

Notional ounces

12,000

625,000

24,000

1,250,000

0

0

0

0

0

0

0

0

Average strike price

1,050

18

16

1,200

0

0

0

0

0

0

0

0

Unrealized gain (loss)

0

1,000,000

3,300,000

1,500,000

8,900,000

8,600,000

Fair value of the contract

3,882,000

3,925,000

184,000

38,000

3,882,000

135,000

Outstanding Put Options of Gold

25,000

12,000

0

0

Weighted Average Strike Price of Put Options

1,150

17

16

Outstanding Put Options of Silver

1,250,000

625,000

0

0

Unrealized Gain (Loss) on Derivatives and Commodity Contracts

($123,000)

($1,995,000)

$1,682,000

Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]

Outstanding provisionally priced sales consists of silver

635,614

Outstanding provisionally priced sales consists of Gold

29,137

Derivative Average Price

16.35

1,221

0

0

0

0

Acquisitions_Details

Acquisitions (Details) (USD $)	0 Months Ended				12 Months Ended			0 Months Ended
	Dec. 17, 2014	Jul. 02, 2014	27-May-14	Apr. 16, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 02, 2014	Dec. 13, 2013
Business Acquisition [Line Items]
Shares Issued for Acquisition				11,572,918
Share Price for Acquisition				$14,980
Business Acquisition, Effective Date of Acquisition	16-Dec-14	2-Jul-14	27-May-14	16-Apr-13
Sale of Stock, Percentage of Ownership after Transaction	20.16%
Payments to Acquire Businesses, Gross	$8,500,000
Payments to Acquire Royalty Interests in Mining Properties			2,200,000		48,395,000	57,034,000	74,734,000
La Preciosa Net Smelter Royalty			1.25%
Acquisition Costs, Period Cost						1,500,000
Payments for Royalties			1,800,000		4,000,000
Business Acquisition, Date of Acquisition Agreement			2-Sep-14
Business Combination, Consideration Transferred				295,841,000
Business Combination, Contingent Consideration, Liability, Noncurrent									8,605,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				116,955,000					26,047,000
Business Combination, Consideration Transferred, Cost of Acquired Entity				412,796,000					34,652,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				412,796,000					34,652,000
Warrants Issued for Acquisition				1,588,768
Warrant Price for Acquisition				$3,640
Paramount Gold & Silver [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description	0.049
La Preciosa Net Smelter Royalty	0.70%
Business Combination, Consideration Transferred	5,300,000
La Preciosa [Member]
Business Acquisition [Line Items]
La Preciosa Net Smelter Royalty								3.00%
Business Combination, Consideration Transferred								$12,000,000

Investments_Details

Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Short-term Investments	$49,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Marketable Securities	5,200,000
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments	600,000
Investment in Marketable Securities (Textual) [Abstract]
Unrealized gain (loss) on equity securities	-2,290,000	-8,489,000	-3,351,000
Impairment of equity securities	-6,593,000	-18,308,000	-605,000
Equity securities [Member]
Available-for-sale Securities
Cost	5,687,000	17,649,000
Gross Unrealized Losses	-8,000	-3,300,000
Gross Unrealized Gains	303,000	172,000
Available-for-sale Securities, Estimated Fair Value	5,982,000	14,521,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Unrealized Losses Total	-8,000	-3,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve Months, Unrealized Losses	-8,000
Less than twelve Months, Fair Value	38,000
Twelve months or more, Unrealized Losses	0
Twelve months or more, Fair Value	0
Unrealized Losses	-8,000
Fair Value	$38,000

Receivables_Details

Receivables (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]
Allowance for Doubtful Accounts Receivable		$0
Receivables - current portion
Accounts receivable - trade	20,448	17,303
Refundable income tax	30,045	8,363
Refundable value added tax	63,805	49,168
Accounts receivable - other	2,623	6,240
Receivables, net current portion	116,921	81,074
Receivables - non-current portion
Refundable value added tax	21,686	36,574
Accounts Receivable, Net	$138,607	$117,648

Inventory_and_Ore_on_Leach_Pad2

Inventory and Ore on Leach Pads (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventories
Concentrate and dore inventory	$23,563	$14,855
Other Inventory, Net of Reserves	40,870	52,250
Supplies	50,498	64,918
Metal and other inventory	114,931	132,023
Ore on Leach Pad, Current	48,204	50,495
Ore on leach pads	37,889	31,528
Inventory, Ore Stockpiles on Leach Pads, Gross	86,093	82,023
Inventory and Ore on Leach Pads	$201,024	$214,046

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Operating Leases, Rent Expense	$11,200,000	$16,700,000	$14,100,000
Property, plant and equipment
Land	1,752,000	1,764,000
Building improvements	647,181,000	855,318,000
Capitalized leases for machinery, equipment and buildings	28,680,000	16,133,000
Property, plant and equipment, gross	677,613,000	873,215,000
Accumulated depreciation and amortization	-464,852,000	-395,520,000
Property Plant and Equipment Net before Construction in Progress	212,761,000	477,695,000
Construction in Progress	15,150,000	8,578,000
Property, plant and equipment, net	$227,911,000	$486,273,000

Mining_Properties_Details

Mining Properties (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Mining Properties
Operational mining properties:	$557,799	$641,305
Accumulated depletion	-368,410	-315,541
Operational mining properties, net	189,389	325,764
Mineral interest	679,429	1,753,129
Accumulated depletion	-367,626	-327,392
Mineral interest, net	311,803	1,425,737
Total mining properties	501,192	1,751,501
Palmarejo [Member]
Mining Properties
Operational mining properties:	137,821	151,845
Accumulated depletion	-121,906	-110,143
Operational mining properties, net	15,915	41,702
Mineral interest	521,349	1,146,572
Accumulated depletion	-332,032	-300,187
Mineral interest, net	189,317	846,385
Total mining properties	205,232	888,087
San Bartolome [Member]
Mining Properties
Operational mining properties:	49,305	70,761
Accumulated depletion	-26,106	-22,236
Operational mining properties, net	23,199	48,525
Mineral interest	17,560	26,643
Accumulated depletion	-10,143	-8,759
Mineral interest, net	7,417	17,884
Total mining properties	30,616	66,409
Kensington [Member]
Mining Properties
Operational mining properties:	217,138	268,351
Accumulated depletion	-106,865	-80,032
Operational mining properties, net	110,273	188,319
Mineral interest	0	0
Accumulated depletion	0	0
Mineral interest, net	0	0
Total mining properties	110,273	188,319
Rochester [Member]
Mining Properties
Operational mining properties:	153,535	150,348
Accumulated depletion	-113,533	-103,130
Operational mining properties, net	40,002	47,218
Mineral interest	0	0
Accumulated depletion	0	0
Mineral interest, net	0	0
Total mining properties	40,002	47,218
Endeavor [Member]
Mining Properties
Operational mining properties:	0	0
Accumulated depletion	0	0
Operational mining properties, net	0	0
Mineral interest	49,059	408,352
Accumulated depletion	0	0
Mineral interest, net	49,059	408,352
Total mining properties	49,059	408,352
Joaquin Project - Argentina [Member]
Mining Properties
Operational mining properties:	0	0
Accumulated depletion	0	0
Operational mining properties, net	0	0
Mineral interest	10,000	93,429
Accumulated depletion	0	0
Mineral interest, net	10,000	93,429
Total mining properties	10,000	93,429
Other Mining Properties [Member]
Mining Properties
Operational mining properties:	0	0
Accumulated depletion	0	0
Operational mining properties, net	0	0
Mineral interest	81,461	78,133
Accumulated depletion	-25,451	-18,446
Mineral interest, net	56,010	59,687
Total mining properties	$56,010	$59,687

Mining_Properties_Details_Text

Mining Properties (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014
	oz
Property, Plant and Equipment [Line Items]
Cumulative Ounces of Silver Received by the Subsidiary	5,400,000
Current Ore Reserve payable Ounces Based on Current Metallurgical Recovery and Current Smelter Contract Terms	1,700,000
McEwen Mining Inc, El Gallo, Magistral Mine [Member]
Property, Plant and Equipment [Line Items]
Net Smelter Return Percentage Paid	3.50%
Dynasty Metals and Mining, Inc Zaruma Mine [Member]
Property, Plant and Equipment [Line Items]
Net Smelter Return Percentage Paid	1.50%
Cerro Bayo Mine [Member]
Property, Plant and Equipment [Line Items]
Net Smelter Return Percentage Paid	2.00%
New Zealand [Members]
Property, Plant and Equipment [Line Items]
Net Smelter Return Percentage Paid	2.50%
Due from Joint Ventures	0.8

Debt_Details

Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 12, 2014	Jan. 29, 2013	Feb. 12, 2013
Debt Instrument [Line Items]
Percentage of Actual Gold Production	50.00%
Long term debt and capital lease obligations
Current	$17,498,000	$2,505,000
Non-current	460,899,000	306,130,000
Long-term Line of Credit	14,800,000
Interest expenses incurred for various debt instruments
Interest Paid on Senior Notes due 2021	32,741,000	21,853,000	0
Interest Paid on Convertible Notes due 2028	173,000	466,000	1,581,000
Line of Credit Facility, Commitment Fee Amount	179,000	612,000	213,000
Write off revolver costs, interest expense	3,035,000	0	2,339,000
Interest Paid on Capital Leases	972,000	415,000	997,000
Interest Expense	0	291,000	881,000
Accretion of Franco Nevada royalty obligation	10,773,000	17,641,000	19,139,000
Amortization of debt issuance costs	1,740,000	2,143,000	1,146,000
Accretion of debt discount	-357,000	576,000	2,536,000
Capitalized interest	-1,710,000	-2,694,000	-2,663,000
Total interest expense, net of capitalized interest	47,546,000	41,303,000	26,169,000
3.25% Convertible Senior Notes due March 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	10,900,000
Long term debt and capital lease obligations
Debt Instrument, Face Amount	0	5,334,000
Senior Notes due 2021 [Member]
Long term debt and capital lease obligations
Debt Instrument, Face Amount	434,900,000			150,000,000	300,000,000
Non-current	437,454,000	300,000,000
Long-term Line of Credit	10,304,000	0
Palmarejo gold production royalty [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	30.50%
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Non-current	13,141,000	796,000
Palmarejo gold production royalty [Member]
Debt Instrument [Line Items]
Royalty Guarantees, Commitments, Ounces of Gold	315,085
Minimum Obligation Paid in Monthly Payments	4,167
Annual Inflation Compounding Adjustment	1.00%
Maximum [Member] | Palmarejo gold production royalty [Member]
Debt Instrument [Line Items]
Royalty Guarantees, Commitments, Ounces of Gold	400,000
Convertible Senior Notes Due March 2028 [Member]
Long term debt and capital lease obligations
Current		0				48,700,000
Debt Instrument, Face Amount	5,334,000
Senior Notes due Two Thousand Twenty One [Member]
Long term debt and capital lease obligations
Current	0	0
Line of Credit, Current	4,481,000	0
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Current	$7,683,000	$2,505,000

Debt_Details_Textual

Debt (Details Textual) (USD $)	0 Months Ended	12 Months Ended
	27-May-14	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 12, 2014	Jan. 29, 2013	Feb. 12, 2013
		oz
Debt Instrument [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$12,800,000
Gold production royalty payments		48,395,000	57,034,000	74,734,000
Debt and capital lease obligations (Textual) [Abstract]
Debt		17,498,000	2,505,000
Interest Expense, Debt		0	291,000	881,000
Accretion of debt discount		-357,000	576,000	2,536,000
Borrowing under term facility		100,000,000
Line of credit facility, increase, additional borrowings		50,000,000
Write off revolver costs, interest expense		3,035,000	0	2,339,000
Line of credit facility, commitment fee amount		179,000	612,000	213,000
Line of Credit Facility, Amount Outstanding		14,800,000
Loss on termination of revolving credit facility		0	0	1,036,000
Percentage of Actual Gold Production		50.00%
Further Payment Made on Number of Additional Ounces of Gold		35,500,000
Payments to Acquire Royalty Interests in Mining Properties	2,200,000	48,395,000	57,034,000	74,734,000
Operating Leases, Future Minimum Payments Receivable, in Two Years		12,000,000
Operating Leases, Future Minimum Payments Receivable, in Three Years		6,100,000
Operating Leases, Future Minimum Payments Receivable, in Four Years		4,600,000
Operating Leases, Future Minimum Payments Receivable, in Five Years		4,700,000
Operating Leases, Future Minimum Payments Receivable, Thereafter		6,000,000
Additional Long term debt and capital lease obligations(Textual) [Abstract]
Implicit Interest Rate		30.00%
Accretion of Royalty Obligation		10,773,000	17,641,000	19,139,000
Remaining Minimum Obligation Under Royalty Agreements		34,000,000	51,200,000
Expensed Interest		47,546,000	41,303,000	26,169,000
Capitalized interest		-1,710,000	-2,694,000	-2,663,000
Convertible Senior Notes Due March 2028 [Member]
Debt and capital lease obligations (Textual) [Abstract]
Interest rate on notes		3.25%	3.25%
Debt Instrument, Face Amount		0	5,334,000
Additional Long term debt and capital lease obligations(Textual) [Abstract]
Debt Instrument, Convertible, Carrying Amount of Equity Component		10,900,000
Senior Notes due Two Thousand Twenty One [Member]
Debt and capital lease obligations (Textual) [Abstract]
Debt Instrument, Repurchase Amount		15,100,000
Long-term Debt		437,500,000
Interest rate on notes		7.88%	7.88%			7.88%
Debt Instrument, Face Amount		434,900,000			150,000,000	300,000,000
Long-term debt, original principal		450,000,000
Line of Credit Facility, Amount Outstanding		10,304,000	0
Banco de Credito Line of Credit [Member]
Debt and capital lease obligations (Textual) [Abstract]
Borrowing under term facility		12,000,000
Line of Credit Facility, Interest Rate at Period End		6.00%
Line of Credit Facility, Expiration Period		360 months
Banco Bisa Line of Credit [Member]
Debt and capital lease obligations (Textual) [Abstract]
Borrowing under term facility		15,000,000
Line of Credit Facility, Interest Rate at Period End		6.00%
Line of Credit Facility, Expiration Period		3 months
Palmarejo gold production royalty [Member]
Debt and capital lease obligations (Textual) [Abstract]
Effective interest rate on the notes		30.50%
Palmarejo gold production royalty [Member]
Debt and capital lease obligations (Textual) [Abstract]
Royalty Guarantees, Commitments, Ounces of Gold		315,085
Further Payment Made on Number of Additional Ounces of Gold		84,915
Palmarejo gold production royalty [Member] | Maximum [Member]
Debt and capital lease obligations (Textual) [Abstract]
Royalty Guarantees, Commitments, Ounces of Gold		400,000
3.25% Convertible Senior Notes due March 2028 [Member]
Debt and capital lease obligations (Textual) [Abstract]
Interest rate on notes		3.25%
Debt Instrument, Face Amount		5,334,000
Debt			0				48,700,000
Debt Instrument, Repurchased Face Amount		$43,300,000
Palmarejo [Member]
Debt and capital lease obligations (Textual) [Abstract]
Expected Royalty Duration		1.7

Supplemental_Guarantor_Informa2

Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Mar. 12, 2014	Jan. 29, 2013
Condensed Financial Statements, Captions [Line Items]
Total Revenue	$635,742		$745,994		$895,492
Costs applicable to sales	477,945	[1]	463,663	[1]	454,562	[1]
Amortization	162,436		229,564		216,032
General and Administrative Expense	40,845		55,343		32,977
Exploration Expense, Mining	21,740		22,360		26,270
Litigation settlement	0		32,046		0
Impairment of Long-Lived Assets Held-for-use	1,472,721		772,993		5,825
Pre-development, reclamation, and other	26,037		15,184		4,086
Total cost and expenses	2,201,724		1,591,153		739,752
Loss on termination of revolving credit facility	0		0		-1,036
Gain (loss) on derivative instruments	-3,618		-82,768		23,487
Impairment of equity securities	-6,593		-18,308		-605
Interest income and other, net	1,375		13,323		15,041
Interest expense, net	-47,546		-41,303		-26,169
Total other income (expense), net	-49,146		36,480		-36,256
Total	-1,615,128		-808,679		119,484
Income and mining tax (expense) benefit	459,244		158,116		-70,807
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	-1,155,884		-650,563		48,677
Income (Loss) from Equity Method Investments	0		0		0
NET INCOME (LOSS)	-1,155,884		-650,563		48,677
Unrealized gain (loss) on equity securities	-2,290		-8,489		-3,351
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	346		83		0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	4,042		11,221		605
Other comprehensive income (loss)	2,098		2,815		-2,746
COMPREHENSIVE INCOME (LOSS)	-1,153,786		-647,748		45,931
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Total Revenue	0		0		0
Costs applicable to sales	0		0		0
Amortization	1,805		1,066		521
General and Administrative Expense	39,976		50,213		30,699
Exploration Expense, Mining	3,560		1,602		1,946
Litigation settlement			0
Impairment of Long-Lived Assets Held-for-use	0		0		0
Pre-development, reclamation, and other	8,813		0		0
Total cost and expenses	54,154		52,881		33,166
Loss on termination of revolving credit facility					0
Gain (loss) on derivative instruments	-1,812		1,346		-3,477
Impairment of equity securities	0		18,097		605
Interest income and other, net	4,406		13,408		5,744
Interest expense, net	-38,389		-25,652		4,158
Total other income (expense), net	-32,171		-31,687		4,458
Total	-86,325		-84,568		-28,708
Income and mining tax (expense) benefit	1,742		78,332		-3,844
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	-84,583		-6,236		-32,552
Income (Loss) from Equity Method Investments	-1,071,301		-644,327		81,229
NET INCOME (LOSS)	-1,155,884		-650,563		48,677
Marketable Securities, Unrealized Gain (Loss)	-2,290		-8,489		-3,351
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	346		83
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	4,042		11,221		605
Other comprehensive income (loss)	2,098		2,815		-2,746
COMPREHENSIVE INCOME (LOSS)	-1,153,786		-647,748		45,931
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total Revenue	261,963		268,023		243,380
Costs applicable to sales	196,805		182,444		159,151
Amortization	65,100		71,655		48,065
General and Administrative Expense	6		3,245		1,101
Exploration Expense, Mining	11,157		8,920		7,930
Litigation settlement			32,046
Impairment of Long-Lived Assets Held-for-use	107,832		130,694		0
Pre-development, reclamation, and other	3,889		3,093		1,323
Total cost and expenses	384,789		432,097		217,570
Loss on termination of revolving credit facility					-1,036
Gain (loss) on derivative instruments	-3,653		-7,896		-4,089
Impairment of equity securities	6,593		211		0
Interest income and other, net	-430		-1,539		859
Interest expense, net	-891		-445		2,997
Total other income (expense), net	-4,261		5,701		915
Total	-127,087		-158,373		26,725
Income and mining tax (expense) benefit	-2,224		-155		-2,930
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	-129,311		-158,528		23,795
Income (Loss) from Equity Method Investments	-4,181		-68		0
NET INCOME (LOSS)	-133,492		-158,596		23,795
Marketable Securities, Unrealized Gain (Loss)	-2,272		-552		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	328		0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	4,042		211		0
Other comprehensive income (loss)	2,098		-341		0
COMPREHENSIVE INCOME (LOSS)	-131,394		-158,937		23,795
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total Revenue	373,779		477,971		652,112
Costs applicable to sales	281,140		281,219		295,411
Amortization	95,531		156,843		167,446
General and Administrative Expense	863		1,885		1,177
Exploration Expense, Mining	7,023		11,838		16,394
Litigation settlement			0
Impairment of Long-Lived Assets Held-for-use	1,364,889		642,299		5,825
Pre-development, reclamation, and other	13,335		12,091		2,763
Total cost and expenses	1,762,781		1,106,175		489,016
Loss on termination of revolving credit facility					0
Gain (loss) on derivative instruments	1,847		-76,218		31,053
Impairment of equity securities	0		0		0
Interest income and other, net	227		4,602		13,071
Interest expense, net	-11,094		-18,354		23,647
Total other income (expense), net	-12,714		62,466		-41,629
Total	-1,401,716		-565,738		121,467
Income and mining tax (expense) benefit	459,726		79,939		-64,033
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	-941,990		-485,799		57,434
Income (Loss) from Equity Method Investments	0		0		0
NET INCOME (LOSS)	-941,990		-485,799		57,434
Marketable Securities, Unrealized Gain (Loss)	0		0		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0		0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0		0		0
Other comprehensive income (loss)	0		0		0
COMPREHENSIVE INCOME (LOSS)	-941,990		-485,799		57,434
Eliminations
Condensed Financial Statements, Captions [Line Items]
Total Revenue	0		0		0
Costs applicable to sales	0		0		0
Amortization	0		0		0
General and Administrative Expense	0		0		0
Exploration Expense, Mining	0		0		0
Litigation settlement			0
Impairment of Long-Lived Assets Held-for-use	0		0		0
Pre-development, reclamation, and other	0		0		0
Total cost and expenses	0		0		0
Loss on termination of revolving credit facility					0
Gain (loss) on derivative instruments	0		0		0
Impairment of equity securities	0		0		0
Interest income and other, net	-2,828		-3,148		-4,633
Interest expense, net	-2,828		3,148		4,633
Total other income (expense), net	0		0		0
Total	0		0		0
Income and mining tax (expense) benefit	0		0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0		0		0
Income (Loss) from Equity Method Investments	1,075,482		644,395		-81,229
NET INCOME (LOSS)	1,075,482		644,395		-81,229
Marketable Securities, Unrealized Gain (Loss)	2,272		552		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	-328		0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	-4,042		-211		0
Other comprehensive income (loss)	-2,098		341		0
COMPREHENSIVE INCOME (LOSS)	1,073,384		644,736		-81,229
Senior Notes due Two Thousand Twenty One [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$434,900						$150,000	$300,000
Debt Instrument, Interest Rate, Stated Percentage	7.88%		7.88%					7.88%
[1]	Excludes amortization.

Supplemental_Guarantor_Informa3

Supplemental Guarantor Information Condensed Consolidated Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			($29,297)
Net Cash Provided by (Used in) Operating Activities	52,927	113,467	271,634
Capital expenditures	-64,244	-100,813	-115,641
Purchase of short term investments and marketable securities	-50,513	-8,052	-12,959
Sales and maturities of short term investments	54,344	34,796	21,695
Proceeds from Discontinued Operations Sale of Assets and Other	8	4,478	3,087
Payments to Acquire Interest in Subsidiaries and Affiliates	0	0	0
Net Cash Provided by (Used in) Investing Activities	-81,734	-186,489	-133,115
Proceeds from Issuance of Unsecured Debt	167,784	300,000	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	-25,902	-60,628	-97,170
Payments to Acquire Royalty Interests in Mining Properties	-48,395	-57,034	-74,734
Share repurchases	0	-27,552	-19,971
Proceeds From Repayment Intercompany Borrowings	0	0	0
Proceeds from (Payments for) Other Financing Activities	-509	-514	3,784
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:	-92,978	-154,272	188,091
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	64,171	81,250	-49,572
Cash and cash equivalents at beginning of period	206,690	125,440	175,012
Cash and cash equivalents at end of period	270,861	206,690	125,440
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	-12,079	-113,214	29,338
Net Cash Provided by (Used in) Operating Activities	-1,144,474	-701,653	58,754
Capital expenditures	-1,849	-3,573	1,531
Purchase of short term investments and marketable securities	-50,013	-2,921	12,913
Sales and maturities of short term investments	49,069	29,274	-21,590
Proceeds from Discontinued Operations Sale of Assets and Other	0	3,266	-3,538
Payments to Acquire Interest in Subsidiaries and Affiliates	1,120,382	642,617	81,229
Net Cash Provided by (Used in) Investing Activities	1,105,510	555,449	-99,883
Proceeds from Issuance of Unsecured Debt	153,000	300,000
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	-18,545	-52,568	-4,005
Payments to Acquire Royalty Interests in Mining Properties	0	0	0
Share repurchases		-27,552	-19,971
Proceeds From Repayment Intercompany Borrowings	-21,697	-22,874	67,082
Proceeds from (Payments for) Other Financing Activities	-509	-514	-861
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:	-112,249	-196,492	-42,245
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	73,285	50,288	1,116
Cash and cash equivalents at beginning of period	137,076	86,788	85,672
Cash and cash equivalents at end of period	210,361	137,076	86,788
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	-4,000	-3,684	0
Net Cash Provided by (Used in) Operating Activities	41,292	17,456	37,426
Capital expenditures	-28,118	-50,810	48,788
Purchase of short term investments and marketable securities	-429	-66	46
Sales and maturities of short term investments	5,261	75	-45
Proceeds from Discontinued Operations Sale of Assets and Other	48	444	-130
Payments to Acquire Interest in Subsidiaries and Affiliates	4,106	68	0
Net Cash Provided by (Used in) Investing Activities	-23,132	-53,973	-48,659
Proceeds from Issuance of Unsecured Debt	0	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	-6,114	-3,171	-79,839
Payments to Acquire Royalty Interests in Mining Properties	0	0	0
Share repurchases		0	0
Proceeds From Repayment Intercompany Borrowings	-7,256	40,279	86,394
Proceeds from (Payments for) Other Financing Activities	0	0	4,645
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:	13,370	-37,108	-11,200
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	4,790	591	-33
Cash and cash equivalents at beginning of period	991	400	433
Cash and cash equivalents at end of period	5,781	991	400
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	-5,250	0	-41
Net Cash Provided by (Used in) Operating Activities	80,627	151,491	256,683
Capital expenditures	-34,277	-46,430	65,322
Purchase of short term investments and marketable securities	-71	-5,065	0
Sales and maturities of short term investments	14	5,447	-60
Proceeds from Discontinued Operations Sale of Assets and Other	-40	768	581
Payments to Acquire Interest in Subsidiaries and Affiliates	0	3,488	0
Net Cash Provided by (Used in) Investing Activities	-39,624	-41,792	-65,802
Proceeds from Issuance of Unsecured Debt	14,784	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	-1,243	-4,889	-13,326
Payments to Acquire Royalty Interests in Mining Properties	-48,395	-57,034	-74,734
Share repurchases		0	0
Proceeds From Repayment Intercompany Borrowings	-20,053	-17,405	-153,476
Proceeds from (Payments for) Other Financing Activities	0	0	0
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:	54,907	79,328	241,536
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-13,904	30,371	-50,655
Cash and cash equivalents at beginning of period	68,623	38,252	88,907
Cash and cash equivalents at end of period	54,719	68,623	38,252
Eliminations
Condensed Financial Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	0	0	0
Net Cash Provided by (Used in) Operating Activities	1,075,482	646,173	-81,229
Capital expenditures	0	0	0
Purchase of short term investments and marketable securities	0	0	0
Sales and maturities of short term investments	0	0	0
Proceeds from Discontinued Operations Sale of Assets and Other	0	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	-1,124,488	-646,173	81,229
Net Cash Provided by (Used in) Investing Activities	-1,124,488	-646,173	81,229
Proceeds from Issuance of Unsecured Debt	0	0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	0	0	0
Payments to Acquire Royalty Interests in Mining Properties	0	0	0
Share repurchases		0	0
Proceeds From Repayment Intercompany Borrowings	49,006	0	0
Proceeds from (Payments for) Other Financing Activities	0	0	0
CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES:	-49,006	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	$0	$0	$0

Supplemental_Guarantor_Informa4

Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 29, 2013
In Thousands, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$270,861	$206,690
Receivables	116,921	81,074
Ore on leach pads	48,204	50,495
Inventory	114,931	132,023
Deferred tax assets	7,364	35,008
Prepaid expenses and other	15,523	25,940
Assets, Current	573,804	531,230
Property, plant, and equipment, net	227,911	486,273
Mining properties, net	501,192	1,751,501
Ore on leach pads	37,889	31,528
Restricted assets	7,037	7,014
Equity securities	5,982	14,521
Receivables	21,686	36,574
Unamortized Debt Issuance Expense	9,851	10,812
Deferred tax assets	60,151	1,189
Other Assets, Noncurrent	9,915	15,336
TOTAL ASSETS	1,455,418	2,885,978
Accounts payable	49,052	53,847
Accrued liabilities and other	51,513	38,266
Debt	17,498	2,505
Royalty obligations	43,678	48,019
Reclamation	3,871	913
Deferred tax liabilities	8,078	1,011
Liabilities, Current	173,690	144,561
Debt	460,899	306,130
Royalty obligations	27,651	65,142
Reclamation	66,943	57,515
Deferred tax liabilities	111,006	556,246
Other long-term liabilities	29,911	25,817
Intercompany Payable Receivable	0	0
Non-current liabilities	696,410	1,010,850
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	1,034	1,028
Additional paid-in capital	2,789,695	2,781,164
Accumulated deficit	-2,202,603	-1,046,719
Accumulated Other Comprehensive Income (Loss), Net of Tax	-2,808	-4,906
Stockholders' equity attributable to parent	585,318	1,730,567	2,198,280	2,136,721
Liabilities and Equity	1,455,418	2,885,978
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	210,361	137,076
Receivables	87	530
Ore on leach pads	0	0
Inventory	0	0
Deferred tax assets	393	0
Prepaid expenses and other	6,349	4,128
Assets, Current	217,190	141,734
Property, plant, and equipment, net	6,155	5,980
Mining properties, net	12,004	0
Ore on leach pads	0	0
Restricted assets	897	830
Equity securities	0	0
Receivables	0	0
Unamortized Debt Issuance Expense	9,851	10,812
Deferred tax assets	30,419	955
Other Assets, Noncurrent	50,813	53,858
TOTAL ASSETS	456,242	1,456,649
Accounts payable	3,414	1,963
Accrued liabilities and other	22,588	16,693
Debt	5,334	0
Royalty obligations	0	0
Reclamation	0	0
Deferred tax liabilities	7,142	0
Liabilities, Current	38,478	18,656
Debt	437,455	305,335
Royalty obligations	0	0
Reclamation	0	0
Deferred tax liabilities	53,201	37,095
Other long-term liabilities	2,582	2,467
Intercompany Payable Receivable	-660,792	-637,471
Non-current liabilities	-167,554	-292,574
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	128,913	1,242,480
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	1,034	1,028
Additional paid-in capital	2,789,695	2,781,164
Accumulated deficit	-2,202,603	-1,046,719
Accumulated Other Comprehensive Income (Loss), Net of Tax	-2,808	-4,906
Stockholders' equity attributable to parent	585,318	1,730,567
Liabilities and Equity	456,242	1,456,649
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	5,781	991
Receivables	11,151	19,982
Ore on leach pads	48,204	50,495
Inventory	54,983	35,290
Deferred tax assets	0	0
Prepaid expenses and other	4,557	5,282
Assets, Current	124,676	112,040
Property, plant, and equipment, net	107,084	143,118
Mining properties, net	159,124	235,537
Ore on leach pads	37,889	31,528
Restricted assets	50	50
Equity securities	5,982	14,521
Receivables	0	0
Unamortized Debt Issuance Expense	0	0
Deferred tax assets	0	0
Other Assets, Noncurrent	5,522	14,616
TOTAL ASSETS	485,942	597,625
Accounts payable	13,391	15,864
Accrued liabilities and other	11,207	8,016
Debt	7,476	1,262
Royalty obligations	5,747	3,934
Reclamation	3,401	0
Deferred tax liabilities	848	0
Liabilities, Current	42,070	29,076
Debt	12,806	255
Royalty obligations	9,623	17,696
Reclamation	46,792	45,894
Deferred tax liabilities	2,963	1,618
Other long-term liabilities	469	544
Intercompany Payable Receivable	427,156	427,085
Non-current liabilities	499,809	493,092
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	45,615	46,215
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	250	250
Additional paid-in capital	79,712	79,712
Accumulated deficit	-133,091	401
Accumulated Other Comprehensive Income (Loss), Net of Tax	-2,808	-4,906
Stockholders' equity attributable to parent	-55,937	75,457
Liabilities and Equity	485,942	597,625
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	54,719	68,623
Receivables	105,683	60,562
Ore on leach pads	0	0
Inventory	59,948	96,733
Deferred tax assets	6,971	35,008
Prepaid expenses and other	4,617	16,530
Assets, Current	231,938	277,456
Property, plant, and equipment, net	114,672	337,175
Mining properties, net	330,064	1,515,964
Ore on leach pads	0	0
Restricted assets	6,090	6,134
Equity securities	0	0
Receivables	21,686	36,574
Unamortized Debt Issuance Expense	0	0
Deferred tax assets	29,732	234
Other Assets, Noncurrent	4,394	320,425
TOTAL ASSETS	738,576	4,072,761
Accounts payable	32,247	36,020
Accrued liabilities and other	17,718	14,611
Debt	4,688	309,472
Royalty obligations	37,931	44,085
Reclamation	1,621	794
Deferred tax liabilities	88	1,011
Liabilities, Current	94,293	405,993
Debt	61,452	64,820
Royalty obligations	18,028	47,446
Reclamation	19,000	11,740
Deferred tax liabilities	54,842	517,533
Other long-term liabilities	26,860	22,806
Intercompany Payable Receivable	233,636	210,386
Non-current liabilities	413,818	874,731
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	1,578,799
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	128,299	122,666
Additional paid-in capital	1,682,830	3,258,037
Accumulated deficit	-1,580,664	-588,666
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Stockholders' equity attributable to parent	230,465	2,792,037
Liabilities and Equity	738,576	4,072,761
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Receivables	0	0
Ore on leach pads	0	0
Inventory	0	0
Deferred tax assets	0	0
Prepaid expenses and other	0	0
Assets, Current	0	0
Property, plant, and equipment, net	0	0
Mining properties, net	0	0
Ore on leach pads	0	0
Restricted assets	0	0
Equity securities	0	0
Receivables	0	0
Unamortized Debt Issuance Expense	0	0
Deferred tax assets	0	0
Other Assets, Noncurrent	-50,814	-373,563
TOTAL ASSETS	-225,342	-3,241,057
Accounts payable	0	0
Accrued liabilities and other	0	-1,054
Debt	0	-308,229
Royalty obligations	0	0
Reclamation	-1,151	119
Deferred tax liabilities	0	0
Liabilities, Current	-1,151	-309,164
Debt	-50,814	-64,280
Royalty obligations	0	0
Reclamation	1,151	-119
Deferred tax liabilities	0	0
Other long-term liabilities	0	0
Intercompany Payable Receivable	0	0
Non-current liabilities	-49,663	-64,399
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	-174,528	-2,867,494
Common stock, par value $0.01 per share; authorized 150,000,000 shares, issued and outstanding 103,384,408 at December 31, 2014 and 102,843,003 at December 31, 2013	-128,549	-122,916
Additional paid-in capital	-1,762,542	-3,337,749
Accumulated deficit	1,713,755	588,265
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,808	4,906
Stockholders' equity attributable to parent	-174,528	-2,867,494
Liabilities and Equity	-225,342	-3,241,057
Senior Notes due Two Thousand Twenty One [Member]
Condensed Financial Statements, Captions [Line Items]
Debt	$437,454	$300,000
Debt Instrument, Interest Rate, Stated Percentage	7.88%	7.88%			7.88%

Commitments_and_Contigencies_D

Commitments and Contigencies (Details Textual) (USD $)	0 Months Ended		12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended
	27-May-14	Jan. 21, 2009	Dec. 31, 2014	Dec. 31, 2013	Jun. 05, 2012	Feb. 28, 2010	Dec. 31, 2015	Oct. 02, 2014	Oct. 14, 2009
			oz		defendant				m
Other Commitments [Line Items]
Litigation Settlement, Expense				$32,000,000
Termination payment								2,000,000
Production to be sold, percent								50.00%
Sale of production, price per ounce of gold								800
Commitment and Contingencies (Textual) [Abstract]
Litigation Settlement, Amount				10,000,000
Maximum Height for Temporary Restriction on Mining									4,400
NSR royalty percentage				3.40%
NSR royalty maximum amount				39,400,000
Payments for Royalties	1,800,000		4,000,000
Further Payment Made on Number of Additional Ounces of Gold			35,500,000
Number of labor agreements in South America			1
Percentage of labor force covered by collective bargaining agreements			11.60%
Purchased royalty		50.00%
Royalty agreement minimum obligation for the period			400,000
Royalty Agreement Minimum Obligation for Per Month			4,167
Royalty Agreement Period		8 years
Rochester [Member]
Commitment and Contingencies (Textual) [Abstract]
Maximum royalty range for gold price per ounce			5.00%
Maximum royalty payable			250,000
Gold price per ounce for maximum royalty range			23.6
Hazardous Waste On-Site [Member] | Callahan Mining Corporation [Member]
Commitment and Contingencies (Textual) [Abstract]
Litigation Settlement, Amount						3,500,000
Number of defendants					5
Subsequent Event [Member]
Other Commitments [Line Items]
Aggregate deposit to be received							$22,000,000

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]
Other Significant Noncash Transaction, Value of Consideration Given	$24,879	$0	$1,857
Noncash or Part Noncash Acquisition, Other Assets Acquired	0	317,826	64,133
Interest Paid	30,691	14,139	6,092
Income Taxes Paid	$20,198	$26,585	$54,680

Subsequent_Events_Subsequent_E

Subsequent Events Subsequent Events (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jan. 12, 2015	Dec. 13, 2013	Apr. 16, 2013
	Y
	oz
Subsequent Event [Line Items]
Business Combination, Consideration Transferred, Cost of Acquired Entity		$34,652	$412,796
Subsequent Event [Member]
Subsequent Event [Line Items]
Acquisition agreement date	12-Jan-15
Business Combination, Consideration Transferred, Cost of Acquired Entity	$105,000
Historical Production Life	30
Wharf ounces produced	2,000,000
Reserve Base of Wharf	560,000
Low End of Wharf Production Guidance	85,000
High End of Wharf Production Guidance	90,000