Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019		Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Revenue		$ 154,870		$ 163,267
Pre-development, reclamation, and other		4,434		4,225
Amortization		41,876		30,777
General and administrative		9,474		8,804
Loss on debt extinguishments				0
Fair value adjustments, net		9,120		4,654
Other, net		60		513
Interest expense, net of capitalized interest		(6,454)		(5,965)
Total other income (expense), net		2,726		(798)
Total		(33,552)		12,640
Income and mining tax (expense) benefit		8,658		(11,949)
Income (loss) from continuing operations		(24,894)		691
Equity income (loss) in consolidated subsidiaries		0		0
Income (loss) from discontinued operations		5,693		550
NET INCOME (LOSS)		(19,201)		1,241
Unrealized gain (loss) on debt securities, net of tax		59		(278)
Reclassification adjustments for impairment of equity securities, net of tax				0
Other comprehensive income (loss)		59		(278)
COMPREHENSIVE INCOME (LOSS)		(19,142)		963
Operating Expenses		191,148		149,829
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue		0		0
Pre-development, reclamation, and other		0		0
Amortization		0		0
General and administrative		0		0
Fair value adjustments, net		0		0
Other, net		(4,303)		(3,719)
Interest expense, net of capitalized interest		4,303		3,719
Total other income (expense), net		0		0
Total		0		0
Income and mining tax (expense) benefit		0		0
Income (loss) from continuing operations		0		0
Equity income (loss) in consolidated subsidiaries		21,150		(3,956)
Income (loss) from discontinued operations		0		0
NET INCOME (LOSS)		21,150		(3,956)
Unrealized gain (loss) on debt securities, net of tax		0		0
Reclassification adjustments for impairment of equity securities, net of tax				0
COMPREHENSIVE INCOME (LOSS)		21,150		(3,956)
Operating Expenses		0		0
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Revenue		0		0
Pre-development, reclamation, and other		160		406
Amortization		221		246
General and administrative		9,474		8,797
Fair value adjustments, net		9,120		4,946
Other, net		4,998		4,475
Interest expense, net of capitalized interest		(5,729)		(5,083)
Total other income (expense), net		8,389		4,338
Total		(1,802)		(5,570)
Income and mining tax (expense) benefit		(2,077)		1,638
Income (loss) from continuing operations		(3,879)		(3,932)
Equity income (loss) in consolidated subsidiaries		(21,015)		4,164
Income (loss) from discontinued operations		5,693		1,009
NET INCOME (LOSS)		(19,201)		1,241
Unrealized gain (loss) on debt securities, net of tax		59		(278)
Reclassification adjustments for impairment of equity securities, net of tax				0
COMPREHENSIVE INCOME (LOSS)		(19,142)		963
Operating Expenses		10,191		9,908
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue		90,699		93,230
Pre-development, reclamation, and other		1,943		1,947
Amortization		18,445		14,205
General and administrative		0		3
Fair value adjustments, net		0		(292)
Other, net		165		(137)
Interest expense, net of capitalized interest		(392)		(353)
Total other income (expense), net		(227)		(782)
Total		(3,062)		5,803
Income and mining tax (expense) benefit		(32)		(1,120)
Income (loss) from continuing operations		(3,094)		4,683
Equity income (loss) in consolidated subsidiaries		(418)		(38)
Income (loss) from discontinued operations		0		(284)
NET INCOME (LOSS)		(3,512)		4,361
Unrealized gain (loss) on debt securities, net of tax		0		0
Reclassification adjustments for impairment of equity securities, net of tax				0
COMPREHENSIVE INCOME (LOSS)		(3,512)		4,361
Operating Expenses		93,534		86,645
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue		64,171		70,037
Pre-development, reclamation, and other		2,331		1,872
Amortization		23,210		16,326
General and administrative		0		4
Fair value adjustments, net		0		0
Other, net		(800)		(106)
Interest expense, net of capitalized interest		(4,636)		(4,248)
Total other income (expense), net		(5,436)		(4,354)
Total		(28,688)		12,407
Income and mining tax (expense) benefit		10,767		(12,467)
Income (loss) from continuing operations		(17,921)		(60)
Equity income (loss) in consolidated subsidiaries		283		(170)
Income (loss) from discontinued operations		0		(175)
NET INCOME (LOSS)		(17,638)		(405)
Unrealized gain (loss) on debt securities, net of tax		0		0
Reclassification adjustments for impairment of equity securities, net of tax				0
COMPREHENSIVE INCOME (LOSS)		(17,638)		(405)
Operating Expenses		87,423		53,276
Product [Member]
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	[1]	131,650		99,340
Product [Member] | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales	[1]	0		0
Product [Member] | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		0	[1]	0
Product [Member] | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		72,022	[1]	68,245
Product [Member] | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		59,628	[1]	31,095
Mineral, Exploration [Member]
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		3,714		6,683
Mineral, Exploration [Member] | Eliminations
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		0		0
Mineral, Exploration [Member] | Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		336		459
Mineral, Exploration [Member] | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		1,124		2,245
Mineral, Exploration [Member] | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Costs applicable to sales		$ 2,254		$ 3,979

[1] Excludes amortization.