Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Revenue		$ 143,855	$ 148,795	$ 169,987	$ 163,267	$ 214,585	$ 159,919	$ 149,540	$ 185,554	$ 625,904		$ 709,598	$ 571,897
Impairment of Long-Lived Assets Held-for-use										0		0	4,446
Pre-development, reclamation, and other						15,106	12,374	11,110	13,962	20,043		18,936	14,411
Amortization		37,053	31,184	29,459	30,777	44,722	32,401	30,733	38,693	128,473		146,549	116,528
General and administrative										31,345		33,616	29,275
Loss on debt extinguishments										0		(9,342)	(21,365)
Fair value adjustments, net										3,638		(864)	(11,581)
Other, net										(24,705)		26,643	98
Interest expense, net of capitalized interest										(24,364)		(16,440)	(36,896)
Total other income (expense), net										(45,431)		(3)	(69,744)
Total										(65,735)		39,923	(10,812)
Income and mining tax (expense) benefit										16,780		(28,998)	33,247
Income (loss) from continuing operations										(48,955)		10,925	22,435
Equity income (loss) in consolidated subsidiaries										0		0	0
Income (loss) from discontinued operations		0	0	0	550	(6,724)	(4,924)	(960)	364	550		(12,244)	32,917
NET INCOME (LOSS)		468	(53,044)	2,930	1,241	7,625	(16,652)	(10,955)	18,663	(48,405)		(1,319)	55,352
Unrealized gain (loss) on debt securities, net of tax										26		3,227	3,222
Reclassification adjustments for impairment of equity securities, net of tax										0		426	703
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax										0		1,354	(2,691)
Other comprehensive income (loss)										26		5,007	1,234
COMPREHENSIVE INCOME (LOSS)										(48,379)		3,688	56,586
Operating Expenses										646,208		669,672	512,965
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
Loss on debt extinguishments												0	0
Fair value adjustments, net										0		0	0
Other, net										(15,457)		(7,726)	(5,084)
Interest expense, net of capitalized interest										15,457		7,726	5,084
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										(2,911)		(43,928)	(126,969)
Income (loss) from discontinued operations										0		0	0
NET INCOME (LOSS)										(2,911)		(43,928)	(126,969)
Unrealized gain (loss) on debt securities, net of tax										0		(915)	(3,156)
Reclassification adjustments for impairment of equity securities, net of tax												(426)	(703)
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax												(486)	3,181
Other comprehensive income (loss)												(1,827)	(678)
COMPREHENSIVE INCOME (LOSS)										(2,911)		(45,755)	(127,647)
Operating Expenses										0		0	0
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										1,246		4,705	2,044
Amortization										940		1,157	1,558
General and administrative										30,868		33,379
Loss on debt extinguishments												(9,342)	(21,365)
Fair value adjustments, net										4,056		0	(1,635)
Other, net										(403)		21,254	4,357
Interest expense, net of capitalized interest										(21,563)		(14,657)	(35,158)
Total other income (expense), net										(17,910)		(2,745)	(53,801)
Total										(52,460)		(43,578)	(87,703)
Income and mining tax (expense) benefit										(548)		2,170	11,733
Income (loss) from continuing operations										(53,008)		(41,408)	(75,970)
Equity income (loss) in consolidated subsidiaries										3,593		40,089	131,322
Income (loss) from discontinued operations										1,010		0	0
NET INCOME (LOSS)										(48,405)		(1,319)	55,352
Unrealized gain (loss) on debt securities, net of tax										26		3,227	3,222
Reclassification adjustments for impairment of equity securities, net of tax												426	703
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax												1,354	(2,691)
Other comprehensive income (loss)												5,007	1,234
COMPREHENSIVE INCOME (LOSS)										(48,379)		3,688	56,586
Operating Expenses										34,550		40,833	33,902
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue										371,248		433,050	423,488
Impairment of Long-Lived Assets Held-for-use													0
Pre-development, reclamation, and other										11,351		7,497	5,839
Amortization										61,489		71,340	77,392
General and administrative										398		28
Loss on debt extinguishments												0	0
Fair value adjustments, net										(418)		(864)	(4,133)
Other, net										617		2,936	2,139
Interest expense, net of capitalized interest										(1,479)		(975)	(861)
Total other income (expense), net										(1,280)		1,097	(2,855)
Total										2,194		48,253	78,189
Income and mining tax (expense) benefit										(1,926)		(5,758)	(7,517)
Income (loss) from continuing operations										268		42,495	70,672
Equity income (loss) in consolidated subsidiaries										(608)		(577)	(4,353)
Income (loss) from discontinued operations										(284)		0	0
NET INCOME (LOSS)										(624)		41,918	66,319
Unrealized gain (loss) on debt securities, net of tax										0		915	3,156
Reclassification adjustments for impairment of equity securities, net of tax												426	703
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax												486	(3,181)
Other comprehensive income (loss)												1,827	678
COMPREHENSIVE INCOME (LOSS)										(624)		43,745	66,997
Operating Expenses										367,774		385,894	342,444
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue										254,656		276,548	148,409
Impairment of Long-Lived Assets Held-for-use													4,446
Pre-development, reclamation, and other										7,446		6,734	6,528
Amortization										66,044		74,052	37,578
General and administrative										79		209
Loss on debt extinguishments												0	0
Fair value adjustments, net										0		0	(5,813)
Other, net										(9,462)		10,179	(1,314)
Interest expense, net of capitalized interest										(16,779)		(8,534)	(5,961)
Total other income (expense), net										(26,241)		1,645	(13,088)
Total										(15,469)		35,248	(1,298)
Income and mining tax (expense) benefit										19,254		(25,410)	29,031
Income (loss) from continuing operations										3,785		9,838	27,733
Equity income (loss) in consolidated subsidiaries										(74)		4,416	0
Income (loss) from discontinued operations										(176)		(12,244)
NET INCOME (LOSS)										3,535		2,010	60,650
Unrealized gain (loss) on debt securities, net of tax										0		0	0
Reclassification adjustments for impairment of equity securities, net of tax												0	0
Reclassification adjustments for realized gain (loss) on sale of equity securities, net of tax												0	0
Other comprehensive income (loss)												0	0
COMPREHENSIVE INCOME (LOSS)										3,535		2,010	60,650
Operating Expenses										243,884		242,945	136,619
Product [Member]
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	[1]	116,507	116,857	108,246	99,340	121,982	101,559	102,229	114,490	440,950		440,260	335,375
Product [Member] | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	[1]									0		0	0
Product [Member] | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										0	[1]	0	0
Product [Member] | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										285,242	[1]	293,340	252,836
Product [Member] | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										155,708	[1]	146,920	82,539
Mineral, Exploration [Member]
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		$ 4,128	$ 8,157	$ 6,429	$ 6,683	$ 7,454	$ 9,792	$ 7,813	$ 5,252	25,397		30,311	12,930
General and administrative													29,275
Mineral, Exploration [Member] | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										0		0	0
General and administrative													0
Mineral, Exploration [Member] | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										1,496		1,592	1,596
General and administrative													28,704
Mineral, Exploration [Member] | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										9,294		13,689	6,127
General and administrative													250
Mineral, Exploration [Member] | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales										$ 14,607		$ 15,030	5,207
General and administrative													$ 321

[1] Excludes amortization.