Segment Reporting (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020		Jun. 30, 2019		Dec. 31, 2019
Financial information relating to reporting segments
Revenue		$ 154,249		$ 162,123		$ 327,416		$ 316,993
Amortization		27,876		43,204		64,038		85,080
Other operating expenses		27,291		12,084		42,766		25,992
Loss on debt extinguishments		0
Fair value adjustments, net, pretax		10,067		(5,296)		1,248		3,824
Interest expense, net of capitalized interest		(5,765)		(6,825)		(10,893)		(13,279)
Other, net		121		643		2,002		703
Income and mining tax (expense) benefit		(2,844)		5,546		1,095		14,204
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(1,209)		(36,764)		(13,109)		(61,658)
NET INCOME (LOSS)		(1,209)	$ (11,900)	(36,764)	$ (19,201)	(13,109)		(55,965)
Income (loss) from discontinued operations		0		0		0		5,693
Assets, Net	[1]	1,208,875		1,535,465		1,208,875		1,535,465		$ 1,215,783
Capital expenditures		16,682		20,749		38,890		48,187
Palmarejo [Member]
Financial information relating to reporting segments
Amortization		7,270		14,212		20,445		28,740
Other operating expenses		3,179		1,769		3,901		2,471
Fair value adjustments, net, pretax		0		0		0		0
Interest expense, net of capitalized interest		(311)		(112)		(466)		(248)
Other, net		(1,651)		(574)		(1,698)		(1,614)
Income and mining tax (expense) benefit		(3,384)		(345)		(1,097)		946
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		2,447		4,674		27,508		8,530
Income (loss) from discontinued operations		0		0		0		0
Assets, Net	[1]	307,215		357,415		307,215		357,415
Capital expenditures		4,533		7,566		11,613		16,242
Rochester [Member]
Financial information relating to reporting segments
Amortization		3,012		3,963		5,916		8,000
Other operating expenses		1,213		1,346		2,459		2,308
Fair value adjustments, net, pretax		0		0		0		0
Interest expense, net of capitalized interest		(300)		(170)		(568)		(312)
Other, net		(25)		43		(78)		16
Income and mining tax (expense) benefit		0		(814)		(43)		(670)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(4,087)		(5,587)		(6,372)		(6,785)
Income (loss) from discontinued operations		0		0		0		0
Assets, Net	[1]	307,221		274,406		307,221		274,406
Capital expenditures		5,803		2,772		10,861		7,417
Kensington
Financial information relating to reporting segments
Amortization		12,853		12,537		24,775		24,264
Other operating expenses		3,519		410		3,850		681
Fair value adjustments, net, pretax		0		0		0		0
Interest expense, net of capitalized interest		(214)		(310)		(523)		(539)
Other, net		(36)		(16)		35		(3)
Income and mining tax (expense) benefit		(474)		0		(474)		0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		5,122		731		12,018		(3,853)
Income (loss) from discontinued operations		0		0		0		0
Assets, Net	[1]	180,290		214,096		180,290		214,096
Capital expenditures		3,909		4,875		8,717		14,231
Wharf [Member]
Financial information relating to reporting segments
Amortization		3,181		2,225		5,625		4,906
Other operating expenses		(118)		753		324		1,417
Fair value adjustments, net, pretax		0		0		0		0
Interest expense, net of capitalized interest		(50)		(28)		(101)		(49)
Other, net		(6)		239		(19)		325
Income and mining tax (expense) benefit		(1,701)		(304)		(2,176)		(477)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		13,066		1,706		17,688		4,903
Income (loss) from discontinued operations		0		0		0		0
Assets, Net	[1]	84,881		104,070		84,881		104,070
Capital expenditures		265		171		674		602
Silvertip [Member]
Financial information relating to reporting segments
Amortization		1,231		9,878		6,576		18,304
Other operating expenses		9,480		386		11,854		627
Fair value adjustments, net, pretax		0		0		0		0
Interest expense, net of capitalized interest		(220)		(390)		(479)		(587)
Other, net		424		(33)		1,554		(221)
Income and mining tax (expense) benefit		(255)		7,589		(255)		17,340
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(13,664)		(17,983)		(36,537)		(32,783)
Income (loss) from discontinued operations		0		0		0		0
Assets, Net	[1]	159,995		415,333		159,995		415,333
Capital expenditures		1,949		5,020		6,565		9,097
Other Mining Properties [Member]
Financial information relating to reporting segments
Amortization		329		389		701		866
Other operating expenses		10,018		7,420		20,378		18,488
Fair value adjustments, net, pretax		10,067		(5,296)		1,248		3,824
Interest expense, net of capitalized interest		(4,670)		(5,815)		(8,756)		(11,544)
Other, net		1,415		984		2,208		2,200
Income and mining tax (expense) benefit		2,970		(580)		5,140		(2,935)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(4,093)		(20,305)		(27,414)		(31,670)
Income (loss) from discontinued operations		0		0		0		5,693
Assets, Net	[1]	169,273		170,145		169,273		170,145
Capital expenditures		223		345		460		598
Gold [Member]
Financial information relating to reporting segments
Revenue		127,902		110,326		255,507		217,090
Gold [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		23,669		33,916		65,316		65,516
Gold [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		8,982		11,195		17,648		22,248
Gold [Member] | Kensington
Financial information relating to reporting segments
Revenue		55,177		45,161		106,843		85,447
Gold [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		40,074		20,054		65,700		43,879
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		26,347		44,963		71,256		85,077
Product, Silver | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		14,301		25,406		46,993		47,031
Product, Silver | Rochester [Member]
Financial information relating to reporting segments
Revenue		11,661		14,257		22,400		29,574
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		385		189		633		406
Product, Silver | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0		5,111		1,230		8,066
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		2,604		(662)		8,238
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		2,604		(662)		8,238
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		4,230		1,315		6,588
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		4,230		1,315		6,588
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		154,249		162,123		327,416		316,993
Product, Metal [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		37,970		59,322		112,309		112,547
Product, Metal [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		20,643		25,452		40,048		51,822
Product, Metal [Member] | Kensington
Financial information relating to reporting segments
Revenue		55,177		45,161		106,843		85,447
Product, Metal [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		40,459		20,243		66,333		44,285
Product, Metal [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0		11,945		1,883		22,892
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]	90,015		131,948		208,932		263,598
Product | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		18,825		36,496		54,799	[2]	69,740	[2]
Product | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		18,336		24,693		35,292	[2]	47,147	[2]
Product | Kensington
Financial information relating to reporting segments
Costs applicable to sales		30,382		29,133		60,889	[2]	61,308	[2]
Product | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		22,472		15,466		40,295	[2]	32,858	[2]
Product | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		0		26,160		17,657	[2]	52,545	[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		11,855		5,719		18,241		9,433
Mineral, Exploration | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		903		1,140		2,395		2,150
Mineral, Exploration | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		1,844		96		2,064		186
Mineral, Exploration | Kensington
Financial information relating to reporting segments
Costs applicable to sales		2,577		2,024		4,349		2,505
Mineral, Exploration | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		101		0		105		0
Mineral, Exploration | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		2,902		670		3,153		731
Mineral, Exploration | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales		$ 3,528		$ 1,789		$ 6,175		$ 3,861

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

[2] Excludes amortization.