Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 228,317	$ 229,728	$ 154,249	$ 173,167	$ 195,040	$ 199,469	$ 162,123	$ 154,870	$ 785,461		$ 711,502		$ 625,904
Impairment of Long-Lived Assets Held-for-use									0		250,814		0
Pre-development, reclamation, and other									55,654		18,421		20,043
Amortization	35,133	32,216	27,876	36,162	48,118	45,678	43,204	41,876	131,387		178,876		128,473
General and administrative									33,722		34,493		31,345
Operating Expenses									703,741		1,056,312		646,208
Loss on debt extinguishments									0		(1,281)		0
Fair value adjustments, net									7,601		16,030		3,638
Other, net									(5,941)		(3,193)		(24,705)
Interest expense, net of capitalized interest									(20,708)		(24,771)		(24,364)
Total other income (expense), net									(19,048)		(13,215)		(45,431)
Total									62,672		(358,025)		(65,735)
Income and mining tax (expense) benefit									(37,045)		11,129		16,780
Income (loss) from continuing operations									25,627		(346,896)		(48,955)
Equity income (loss) in consolidated subsidiaries									0		0		0
Income (loss) from discontinued operations	0	0	0	0	0	0	0	5,693	0		5,693		550
NET INCOME (LOSS)									25,627		(341,203)		(48,405)
Unrealized gain (loss) on debt and equity securities									0		59		26
Reclassification adjustments for impairment of equity securities, net of tax									(12,434)		(136)		0
Reclassification adjustments for impairment of equity securities									1,434
Other comprehensive income (loss)									(11,000)		(77)		26
COMPREHENSIVE INCOME (LOSS)									14,627		(341,280)		(48,379)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue									0		0		0
Impairment of Long-Lived Assets Held-for-use											0
Pre-development, reclamation, and other									0		0		0
Amortization									0		0		0
General and administrative									0		0		0
Operating Expenses									0		0		0
Loss on debt extinguishments											0
Fair value adjustments, net									0		0		0
Other, net									(14,353)		(17,139)		(15,457)
Interest expense, net of capitalized interest									14,353		17,139		15,457
Total other income (expense), net									0		0		0
Total									0		0		0
Income and mining tax (expense) benefit									0		0		0
Income (loss) from continuing operations									0		0		0
Equity income (loss) in consolidated subsidiaries									(60,313)		324,068		(2,911)
Income (loss) from discontinued operations									0		0		0
NET INCOME (LOSS)									(60,313)		324,068		(2,911)
Unrealized gain (loss) on debt and equity securities											0		0
Reclassification adjustments for impairment of equity securities, net of tax									0		0
Reclassification adjustments for impairment of equity securities									0
Other comprehensive income (loss)									0		0		0
COMPREHENSIVE INCOME (LOSS)									(60,313)		324,068		(2,911)
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Revenue									0		0		0
Impairment of Long-Lived Assets Held-for-use											0
Pre-development, reclamation, and other									2,001		346		1,246
Amortization									742		876		940
General and administrative									33,699		31,913		30,868
Operating Expenses									37,786		34,627		34,550
Loss on debt extinguishments											(1,281)
Fair value adjustments, net									7,601		16,039		4,056
Other, net									12,341		18,993		(403)
Interest expense, net of capitalized interest									(16,796)		(20,774)		(21,563)
Total other income (expense), net									3,146		12,977		(17,910)
Total									(34,640)		(21,650)		(52,460)
Income and mining tax (expense) benefit									(624)		(1,518)		(548)
Income (loss) from continuing operations									(35,264)		(23,168)		(53,008)
Equity income (loss) in consolidated subsidiaries									60,891		(323,728)		3,593
Income (loss) from discontinued operations									0		5,693		1,010
NET INCOME (LOSS)									25,627		(341,203)		(48,405)
Unrealized gain (loss) on debt and equity securities											59		26
Reclassification adjustments for impairment of equity securities, net of tax									(12,434)		(136)
Reclassification adjustments for impairment of equity securities									1,434
Other comprehensive income (loss)									(11,000)		(77)		26
COMPREHENSIVE INCOME (LOSS)									14,627		(341,280)		(48,379)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue									496,996		414,548		371,248
Impairment of Long-Lived Assets Held-for-use											0
Pre-development, reclamation, and other									19,442		11,204		11,351
Amortization									76,830		81,759		61,489
General and administrative									3		808		398
Operating Expenses									415,861		406,487		367,774
Loss on debt extinguishments											0
Fair value adjustments, net									0		(9)		(418)
Other, net									(2,860)		(1,106)		617
Interest expense, net of capitalized interest									(3,150)		(2,591)		(1,479)
Total other income (expense), net									(6,010)		(3,706)		(1,280)
Total									75,125		4,355		2,194
Income and mining tax (expense) benefit									(8,738)		(3,750)		(1,926)
Income (loss) from continuing operations									66,387		605		268
Equity income (loss) in consolidated subsidiaries									(12,956)		(10,100)		(608)
Income (loss) from discontinued operations									0		0		(284)
NET INCOME (LOSS)									53,431		(9,495)		(624)
Unrealized gain (loss) on debt and equity securities											0		0
Reclassification adjustments for impairment of equity securities, net of tax									0		0
Reclassification adjustments for impairment of equity securities									0
Other comprehensive income (loss)									0		0		0
COMPREHENSIVE INCOME (LOSS)									53,431		(9,495)		(624)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue									288,465		296,954		254,656
Impairment of Long-Lived Assets Held-for-use											250,814
Pre-development, reclamation, and other									34,211		6,871		7,446
Amortization									53,815		96,241		66,044
General and administrative									20		1,772		79
Operating Expenses									250,094		615,198		243,884
Loss on debt extinguishments											0
Fair value adjustments, net									0		0
Other, net									(1,069)		(3,941)		(9,462)
Interest expense, net of capitalized interest									(15,115)		(18,545)		(16,779)
Total other income (expense), net									(16,184)		(22,486)		(26,241)
Total									22,187		(340,730)		(15,469)
Income and mining tax (expense) benefit									(27,683)		16,397		19,254
Income (loss) from continuing operations									(5,496)		(324,333)		3,785
Equity income (loss) in consolidated subsidiaries									12,378		9,760		(74)
Income (loss) from discontinued operations									0		0		(176)
NET INCOME (LOSS)									6,882		(314,573)		3,535
Unrealized gain (loss) on debt and equity securities											0		0
Reclassification adjustments for impairment of equity securities, net of tax									0		0
Reclassification adjustments for impairment of equity securities									0
Other comprehensive income (loss)									0		0		0
COMPREHENSIVE INCOME (LOSS)									6,882		(314,573)		3,535
Product
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	118,631	112,772	90,015	118,917	146,631	140,952	131,948	131,650	440,335	[1]	551,181	[1]	440,950	[1]
Product | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									0		0		0
Product | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									0		0		0
Product | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									297,473		300,496		285,242
Product | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									142,862		250,685		155,708
Mineral, Exploration
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	$ 11,584	$ 12,818	$ 11,855	$ 6,386	$ 7,201	$ 5,893	$ 5,719	$ 3,714	42,643		22,527		25,397
Impairment of Long-Lived Assets Held-for-use									0		250,814		0
Mineral, Exploration | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									0		0		0
Mineral, Exploration | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									1,344		1,492		1,496
Mineral, Exploration | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									22,113		12,220		9,294
Mineral, Exploration | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									$ 19,186		$ 8,815		$ 14,607

[1] Excludes amortization.