Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 195,040	$ 199,469	$ 162,123	$ 154,870	$ 143,855	$ 148,795	$ 169,987	$ 163,267	$ 711,502		$ 625,904		$ 709,598
Impairment of Long-Lived Assets Held-for-use									250,814		0		0
Pre-development, reclamation, and other									18,421		20,043		18,936
Amortization	48,118	45,678	43,204	41,876	37,053	31,184	29,459	30,777	178,876		128,473		146,549
General and administrative									34,493		31,345		33,616
Loss on debt extinguishments									(1,281)		0		(9,342)
Fair value adjustments, net									16,030		3,638		(864)
Other, net									(3,193)		(24,705)		26,643
Interest expense, net of capitalized interest									(24,771)		(24,364)		(16,440)
Total other income (expense), net									(13,215)		(45,431)		(3)
Total									(358,025)		(65,735)		39,923
Income and mining tax (expense) benefit									11,129		16,780		(28,998)
Income (loss) from continuing operations									(346,896)		(48,955)		10,925
Equity income (loss) in consolidated subsidiaries									0		0		0
Income (loss) from discontinued operations	0	0	0	5,693	0	0	0	550	5,693		550		(12,244)
NET INCOME (LOSS)	(270,961)	(14,277)	(36,764)	(19,201)	468	(53,044)	2,930	1,241	(341,203)		(48,405)		(1,319)
Unrealized gain (loss) on debt securities, net of tax									59		26		3,227
Reclassification adjustments for impairment of equity securities, net of tax									(136)		0		0
Reclassification adjustments for impairment of equity securities									0		0		426
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax									0		0		1,354
Other comprehensive income (loss)									(77)		26		5,007
COMPREHENSIVE INCOME (LOSS)									(341,280)		(48,379)		3,688
Operating Expenses									1,056,312		646,208		669,672
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue									0		0		0
Pre-development, reclamation, and other									0		0		0
Amortization									0		0		0
General and administrative									0		0		0
Loss on debt extinguishments									0				0
Fair value adjustments, net									0		0		0
Other, net									(17,139)		(15,457)		(7,726)
Interest expense, net of capitalized interest									17,139		15,457		7,726
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									324,068		(2,911)		(43,928)
Income (loss) from discontinued operations									0		0		0
NET INCOME (LOSS)									324,068		(2,911)		(43,928)
Unrealized gain (loss) on debt securities, net of tax									0		0		(915)
Reclassification adjustments for impairment of equity securities, net of tax									0
Reclassification adjustments for impairment of equity securities													(426)
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax													(486)
Other comprehensive income (loss)													(1,827)
COMPREHENSIVE INCOME (LOSS)									324,068		(2,911)		(45,755)
Operating Expenses									0		0		0
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Revenue									0		0		0
Pre-development, reclamation, and other									346		1,246		4,705
Amortization									876		940		1,157
General and administrative									31,913		30,868		33,379
Loss on debt extinguishments									(1,281)				(9,342)
Fair value adjustments, net									16,039		4,056		0
Other, net									18,993		(403)		21,254
Interest expense, net of capitalized interest									(20,774)		(21,563)		(14,657)
Total other income (expense), net									12,977		(17,910)		(2,745)
Total									(21,650)		(52,460)		(43,578)
Income and mining tax (expense) benefit									(1,518)		(548)		2,170
Income (loss) from continuing operations									(23,168)		(53,008)		(41,408)
Equity income (loss) in consolidated subsidiaries									(323,728)		3,593		40,089
Income (loss) from discontinued operations									5,693		1,010		0
NET INCOME (LOSS)									(341,203)		(48,405)		(1,319)
Unrealized gain (loss) on debt securities, net of tax									59		26		3,227
Reclassification adjustments for impairment of equity securities, net of tax									(136)
Reclassification adjustments for impairment of equity securities													426
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax													1,354
Other comprehensive income (loss)													5,007
COMPREHENSIVE INCOME (LOSS)									(341,280)		(48,379)		3,688
Operating Expenses									34,627		34,550		40,833
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue									414,548		371,248		433,050
Pre-development, reclamation, and other									11,204		11,351		7,497
Amortization									81,759		61,489		71,340
General and administrative									808		398		28
Loss on debt extinguishments									0				0
Fair value adjustments, net									(9)		(418)		(864)
Other, net									(1,106)		617		2,936
Interest expense, net of capitalized interest									(2,591)		(1,479)		(975)
Total other income (expense), net									(3,706)		(1,280)		1,097
Total									4,355		2,194		48,253
Income and mining tax (expense) benefit									(3,750)		(1,926)		(5,758)
Income (loss) from continuing operations									605		268		42,495
Equity income (loss) in consolidated subsidiaries									(10,100)		(608)		(577)
Income (loss) from discontinued operations									0		(284)		0
NET INCOME (LOSS)									(9,495)		(624)		41,918
Unrealized gain (loss) on debt securities, net of tax									0				915
Reclassification adjustments for impairment of equity securities, net of tax									0
Reclassification adjustments for impairment of equity securities													426
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax													486
Other comprehensive income (loss)													1,827
COMPREHENSIVE INCOME (LOSS)									(9,495)		(624)		43,745
Operating Expenses									406,487		367,774		385,894
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue									296,954		254,656		276,548
Pre-development, reclamation, and other									6,871		7,446		6,734
Amortization									96,241		66,044		74,052
General and administrative									1,772		79		209
Loss on debt extinguishments									0				0
Fair value adjustments, net									0				0
Other, net									(3,941)		(9,462)		10,179
Interest expense, net of capitalized interest									(18,545)		(16,779)		(8,534)
Total other income (expense), net									(22,486)		(26,241)		1,645
Total									(340,730)		(15,469)		35,248
Income and mining tax (expense) benefit									16,397		19,254		(25,410)
Income (loss) from continuing operations									(324,333)		3,785		9,838
Equity income (loss) in consolidated subsidiaries									9,760		(74)		4,416
Income (loss) from discontinued operations									0		(176)		(12,244)
NET INCOME (LOSS)									(314,573)		3,535		2,010
Unrealized gain (loss) on debt securities, net of tax									0				0
Reclassification adjustments for impairment of equity securities, net of tax									0
Reclassification adjustments for impairment of equity securities													0
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax													0
Other comprehensive income (loss)													0
COMPREHENSIVE INCOME (LOSS)									(314,573)		3,535		2,010
Operating Expenses									615,198		243,884		242,945
Product
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	146,631	140,952	131,948	131,650	116,507	116,857	108,246	99,340	551,181	[1]	440,950	[1]	440,260	[1]
Product | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									0		0	[1]	0	[1]
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									300,496		285,242		293,340
Product | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									250,685		155,708		146,920
Mineral, Exploration
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	$ 7,201	$ 5,893	$ 5,719	$ 3,714	$ 4,128	$ 8,157	$ 6,429	$ 6,683	22,527		25,397		30,311
Impairment of Long-Lived Assets Held-for-use									250,814
Mineral, Exploration | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									0		0		0
Impairment of Long-Lived Assets Held-for-use									0
Mineral, Exploration | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									1,492		1,496		1,592
Impairment of Long-Lived Assets Held-for-use									0
Mineral, Exploration | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									12,220		9,294		13,689
Impairment of Long-Lived Assets Held-for-use									0
Mineral, Exploration | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales									8,815		$ 14,607		$ 15,030
Impairment of Long-Lived Assets Held-for-use									$ 250,814

[1] Excludes amortization.