Segment Reporting (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		Dec. 31, 2019
Financial information relating to reporting segments
Revenue		$ 229,728			$ 199,469			$ 557,144		$ 516,462
Amortization		32,216			45,678			96,254		130,758
Other operating expenses		22,788			14,486			65,554		40,478
Loss on debt extinguishments		0			(1,282)			0		(1,282)
Fair value adjustments, net, pretax		2,243			4,377			3,491		8,201
Interest expense, net of capitalized interest		(5,096)			(5,980)			(15,989)		(19,259)
Other, net		(6,312)			(3,634)			(4,310)		(2,931)
Income and mining tax (expense) benefit		(13,113)			(218)			(12,018)		13,986
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		26,856			(14,277)			13,747		(75,935)
NET INCOME (LOSS)		26,856	$ (1,209)	$ (11,900)	(14,277)	$ (36,764)	$ (19,201)	13,747		(70,242)
Income (loss) from discontinued operations		0			0			0		5,693
Assets, Net	[1]	1,207,851			1,520,442			1,207,851		1,520,442		$ 1,215,783
Capital expenditures		22,996			30,678			61,886		78,865
Palmarejo [Member]
Financial information relating to reporting segments
Amortization		11,912			15,840			32,357		44,580
Other operating expenses		2,378			1,327			6,279		3,798
Loss on debt extinguishments		0			0			0
Fair value adjustments, net, pretax		0			0			0		0
Interest expense, net of capitalized interest		(201)			(74)			(667)		(322)
Other, net		(1,168)			(2,535)			(2,866)		(4,149)
Income and mining tax (expense) benefit		(6,841)			(1,630)			(7,938)		(684)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		23,026			10,926			50,534		19,456
Income (loss) from discontinued operations		0			0			0		0
Assets, Net	[1]	302,599			342,274			302,599		342,274
Capital expenditures		4,998			7,818			16,611		24,060
Rochester [Member]
Financial information relating to reporting segments
Amortization		3,278			4,250			9,194		12,250
Other operating expenses		1,376			1,210			3,835		3,518
Loss on debt extinguishments		0			0			0
Fair value adjustments, net, pretax		0			0			0		0
Interest expense, net of capitalized interest		(283)			(287)			(851)		(599)
Other, net		(2,502)			(368)			(2,580)		(352)
Income and mining tax (expense) benefit		(143)			(2,067)			(186)		(2,737)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		4,959			(8,595)			(1,413)		(15,380)
Income (loss) from discontinued operations		0			0			0		0
Assets, Net	[1]	325,165			283,229			325,165		283,229
Capital expenditures		9,773			10,248			20,634		17,665
Kensington
Financial information relating to reporting segments
Amortization		11,523			13,552			36,298		37,816
Other operating expenses		3,448			281			7,298		962
Loss on debt extinguishments		0			0			0
Fair value adjustments, net, pretax		0			0			0		0
Interest expense, net of capitalized interest		(296)			(453)			(819)		(992)
Other, net		(34)			(99)			1		(102)
Income and mining tax (expense) benefit		(380)			0			(854)		0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		1,749			7,253			13,767		3,400
Income (loss) from discontinued operations		0			0			0		0
Assets, Net	[1]	177,700			204,926			177,700		204,926
Capital expenditures		5,333			4,944			14,050		19,175
Wharf [Member]
Financial information relating to reporting segments
Amortization		4,000			3,301			9,625		8,207
Other operating expenses		127			698			451		2,115
Loss on debt extinguishments		0			0			0
Fair value adjustments, net, pretax		0			0			0		0
Interest expense, net of capitalized interest		(48)			(26)			(149)		(75)
Other, net		7			(151)			(12)		174
Income and mining tax (expense) benefit		(2,630)			(1,672)			(4,806)		(2,149)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		28,287			8,657			45,975		13,560
Income (loss) from discontinued operations		0			0			0		0
Assets, Net	[1]	76,247			99,600			76,247		99,600
Capital expenditures		545			759			1,219		1,361
Silvertip [Member]
Financial information relating to reporting segments
Amortization		1,185			8,268			7,761		26,572
Other operating expenses		5,916			254			17,770		881
Loss on debt extinguishments		0			0			0
Fair value adjustments, net, pretax		0			0			0		0
Interest expense, net of capitalized interest		(124)			(410)			(603)		(997)
Other, net		451			(190)			2,005		(411)
Income and mining tax (expense) benefit		21			916			(234)		18,256
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(10,673)			(21,899)			(47,210)		(54,682)
Income (loss) from discontinued operations		0			0			0		0
Assets, Net	[1]	155,932			417,678			155,932		417,678
Capital expenditures		2,065			6,359			8,630		15,456
Other Mining Properties [Member]
Financial information relating to reporting segments
Amortization		318			467			1,019		1,333
Other operating expenses		9,543			10,716			29,921		29,204
Loss on debt extinguishments		0			(1,282)			0
Fair value adjustments, net, pretax		2,243			4,377			3,491		8,201
Interest expense, net of capitalized interest		(4,144)			(4,730)			(12,900)		(16,274)
Other, net		(3,066)			(291)			(858)		1,909
Income and mining tax (expense) benefit		(3,140)			4,235			2,000		1,300
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(20,492)			(10,619)			(47,906)		(42,289)
Income (loss) from discontinued operations		0			0			0		5,693
Assets, Net	[1]	170,208			172,735			170,208		172,735
Capital expenditures		282			550			742		1,148
Gold [Member]
Financial information relating to reporting segments
Revenue		167,132			141,871			422,639		358,961
Gold [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		39,416			41,547			104,732		107,063
Gold [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		12,860			11,290			30,508		33,538
Gold [Member] | Kensington
Financial information relating to reporting segments
Revenue		52,357			52,636			159,200		138,083
Gold [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		62,499			36,398			128,199		80,277
Gold [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Gold [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Silver
Financial information relating to reporting segments
Revenue		62,596			51,581			133,852		136,658
Product, Silver | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		42,339			29,790			89,332		76,821
Product, Silver | Rochester [Member]
Financial information relating to reporting segments
Revenue		19,250			16,191			41,650		45,765
Product, Silver | Kensington
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Silver | Wharf [Member]
Financial information relating to reporting segments
Revenue		1,007			293			1,640		699
Product, Silver | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0			5,307			1,230		13,373
Product, Silver | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Zinc
Financial information relating to reporting segments
Revenue		0			2,046			(662)		10,284
Product, Zinc | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Zinc | Rochester [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Zinc | Kensington
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Zinc | Wharf [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Zinc | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0			2,046			(662)		10,284
Product, Zinc | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Lead
Financial information relating to reporting segments
Revenue		0			3,971			1,315		10,559
Product, Lead | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Lead | Rochester [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Lead | Kensington
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Lead | Wharf [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Lead | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0			3,971			1,315		10,559
Product, Lead | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product, Metal [Member]
Financial information relating to reporting segments
Revenue		229,728			199,469			557,144		516,462
Product, Metal [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		81,755			71,337			194,064		183,884
Product, Metal [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		32,110			27,481			72,158		79,303
Product, Metal [Member] | Kensington
Financial information relating to reporting segments
Revenue		52,357			52,636			159,200		138,083
Product, Metal [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		63,506			36,691			129,839		80,976
Product, Metal [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0			11,324			1,883		34,216
Product, Metal [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0			0			0		0
Product
Financial information relating to reporting segments
Costs applicable to sales	[2]	112,772			140,952			321,704		404,550
Product | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		34,251			37,397			89,050	[2]	107,137	[2]
Product | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		19,104			27,749			54,396	[2]	74,896	[2]
Product | Kensington
Financial information relating to reporting segments
Costs applicable to sales		31,530			29,533			92,419	[2]	90,841	[2]
Product | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		27,887			22,084			68,182	[2]	54,942	[2]
Product | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		0			24,189			17,657	[2]	76,734	[2]
Product | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales		0			0			0	[2]	0	[2]
Mineral, Exploration
Financial information relating to reporting segments
Costs applicable to sales		12,818			5,893			31,059		15,326
Mineral, Exploration | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		1,978			1,608			4,373		3,758
Mineral, Exploration | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		465			145			2,529		331
Mineral, Exploration | Kensington
Financial information relating to reporting segments
Costs applicable to sales		3,397			1,465			7,746		3,970
Mineral, Exploration | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		534			102			639		102
Mineral, Exploration | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		3,920			828			7,073		1,559
Mineral, Exploration | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales		$ 2,524			$ 1,745			$ 8,699		$ 5,606

[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interests

[2] Excludes amortization.