Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Condensed Financial Statements, Captions [Line Items]
Revenue		$ 229,728			$ 199,469			$ 557,144	$ 516,462
Pre-development, reclamation, and other		15,031			4,851			40,261	13,619
Amortization		32,216			45,678			96,254	130,758
General and administrative		7,757			9,635			25,293	26,859
Operating Expenses		180,594			207,009			514,571	591,112
Loss on debt extinguishments		0			(1,282)			0	(1,282)
Fair value adjustments, net		2,243			4,377			3,491	8,201
Other, net		(6,312)			(3,634)			(4,310)	(2,931)
Interest expense, net of capitalized interest		(5,096)			(5,980)			(15,989)	(19,259)
Total other income (expense), net		(9,165)			(6,519)			(16,808)	(15,271)
Total		39,969			(14,059)			25,765	(89,921)
Income and mining tax (expense) benefit		(13,113)			(218)			(12,018)	13,986
Income (loss) from continuing operations		26,856			(14,277)			13,747	(75,935)
Equity income (loss) in consolidated subsidiaries		0			0			0	0
Income (loss) from discontinued operations		0			0			0	5,693
NET INCOME (LOSS)		26,856	$ (1,209)	$ (11,900)	(14,277)	$ (36,764)	$ (19,201)	13,747	(70,242)
Unrealized gain (loss) on debt and equity securities		0			0			0	59
Reclassification adjustments for impairment of equity securities, net of tax		(18,606)			1,132			(26,176)	1,132
Other comprehensive income (loss)		(18,606)	$ (7,776)	$ 206	1,132		$ 59	(26,176)	1,191
COMPREHENSIVE INCOME (LOSS)		8,250			(13,145)			(12,429)	(69,051)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue		0			0			0	0
Pre-development, reclamation, and other		0			0			0	0
Amortization		0			0			0	0
General and administrative		0			0			0	0
Operating Expenses		0			0			0	0
Loss on debt extinguishments		0			0			0	0
Fair value adjustments, net		0			0			0	0
Other, net		(3,706)			(4,360)			(11,061)	(12,973)
Interest expense, net of capitalized interest		3,706			4,360			11,061	12,973
Total other income (expense), net		0			0			0	0
Total		0			0			0	0
Income and mining tax (expense) benefit		0			0			0	0
Income (loss) from continuing operations		0			0			0	0
Equity income (loss) in consolidated subsidiaries		(41,416)			11,280			(42,814)	56,479
Income (loss) from discontinued operations		0						0	0
NET INCOME (LOSS)		(41,416)			11,280			(42,814)	56,479
Unrealized gain (loss) on debt and equity securities									0
Reclassification adjustments for impairment of equity securities, net of tax		0			0			0	0
Other comprehensive income (loss)		0						0	0
COMPREHENSIVE INCOME (LOSS)		(41,416)			11,280			(42,814)	56,479
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Revenue		0			0			0	0
Pre-development, reclamation, and other		1,728			15			1,850	255
Amortization		175			216			577	656
General and administrative		7,754			8,973			25,276	24,429
Operating Expenses		9,945			9,634			28,701	26,456
Loss on debt extinguishments		0			(1,282)			0	(1,282)
Fair value adjustments, net		2,243			4,378			3,491	8,210
Other, net		163			4,557			8,701	14,648
Interest expense, net of capitalized interest		(4,145)			(4,729)			(12,920)	(16,273)
Total other income (expense), net		(1,739)			2,924			(728)	5,303
Total		(11,684)			(6,710)			(29,429)	(21,153)
Income and mining tax (expense) benefit		(2,872)			3,808			166	1,420
Income (loss) from continuing operations		(14,556)			(2,902)			(29,263)	(19,733)
Equity income (loss) in consolidated subsidiaries		41,410			(11,371)			43,008	(56,200)
Income (loss) from discontinued operations		0						0	5,693
NET INCOME (LOSS)		26,854			(14,273)			13,745	(70,240)
Unrealized gain (loss) on debt and equity securities									59
Reclassification adjustments for impairment of equity securities, net of tax		(18,606)			1,132			(26,176)	1,132
Other comprehensive income (loss)		(18,606)						(26,176)	1,191
COMPREHENSIVE INCOME (LOSS)		8,248			(13,141)			(12,431)	(69,049)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue		147,973			116,808			361,197	298,361
Pre-development, reclamation, and other		4,379			4,465			12,353	8,397
Amortization		18,944			21,751			55,547	58,922
General and administrative		1			208			3	778
Operating Expenses		108,478			110,801			301,513	296,996
Loss on debt extinguishments		0			0			0	0
Fair value adjustments, net		0			(1)			0	(9)
Other, net		(2,540)			(814)			(2,638)	(376)
Interest expense, net of capitalized interest		(862)			(838)			(2,331)	(1,738)
Total other income (expense), net		(3,402)			(1,653)			(4,969)	(2,123)
Total		36,093			4,354			54,715	(758)
Income and mining tax (expense) benefit		(3,153)			(3,740)			(5,846)	(4,888)
Income (loss) from continuing operations		32,940			614			48,869	(5,646)
Equity income (loss) in consolidated subsidiaries		(3,046)			(4)			(10,221)	(634)
Income (loss) from discontinued operations		0						0	0
NET INCOME (LOSS)		29,894			610			38,648	(6,280)
Unrealized gain (loss) on debt and equity securities									0
Reclassification adjustments for impairment of equity securities, net of tax		0			0			0	0
Other comprehensive income (loss)		0						0	0
COMPREHENSIVE INCOME (LOSS)		29,894			610			38,648	(6,280)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue		81,755			82,661			195,947	218,101
Pre-development, reclamation, and other		8,924			371			26,058	4,967
Amortization		13,097			23,711			40,130	71,180
General and administrative		2			454			14	1,652
Operating Expenses		62,171			86,574			184,357	267,660
Loss on debt extinguishments		0			0			0	0
Fair value adjustments, net		0			0			0	0
Other, net		(229)			(3,017)			688	(4,230)
Interest expense, net of capitalized interest		(3,795)			(4,773)			(11,799)	(14,221)
Total other income (expense), net		(4,024)			(7,790)			(11,111)	(18,451)
Total		15,560			(11,703)			479	(68,010)
Income and mining tax (expense) benefit		(7,088)			(286)			(6,338)	17,454
Income (loss) from continuing operations		8,472			(11,989)			(5,859)	(50,556)
Equity income (loss) in consolidated subsidiaries		3,052			95			10,027	355
Income (loss) from discontinued operations		0						0	0
NET INCOME (LOSS)		11,524			(11,894)			4,168	(50,201)
Unrealized gain (loss) on debt and equity securities									0
Reclassification adjustments for impairment of equity securities, net of tax		0			0			0	0
Other comprehensive income (loss)		0						0	0
COMPREHENSIVE INCOME (LOSS)		11,524			(11,894)			4,168	(50,201)
Product
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	[1]	112,772			140,952			321,704	404,550
Product | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		0			0			0	0
Product | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		0			0			0	0
Product | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		78,521			79,367			214,997	220,680
Product | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		34,251			61,585			106,707	183,870
Mineral, Exploration
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		12,818			5,893			31,059	15,326
Mineral, Exploration | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		0			0			0	0
Mineral, Exploration | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		288			430			998	1,116
Mineral, Exploration | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		6,633			5,010			18,613	8,219
Mineral, Exploration | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		$ 5,897			$ 453			$ 11,448	$ 5,991

[1] Excludes amortization.