Segment Reporting (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financial information relating to reporting segments
Revenue		$ 214,858		$ 154,249		$ 416,975	$ 327,416
Amortization		31,973		27,876		61,910	64,038
Other operating expenses		23,205		27,291		48,471	42,766
Loss on debt extinguishments		0		0		(9,173)	0
Fair value adjustments, net, pretax		37,239		10,067		33,440	1,248
Interest expense, net of capitalized interest		(5,093)		(5,765)		(10,003)	(10,893)
Other, net		701		121		4,328	2,002
Income and mining tax (expense) benefit		(15,340)		(2,844)		(28,126)	1,095
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		32,146		(1,209)		34,206	(13,109)
NET INCOME (LOSS)		32,146	$ 2,060	(1,209)	$ (11,900)	34,206	(13,109)
Assets, Net	[1]	1,339,442		1,208,875		1,339,442	1,208,875	$ 1,232,153
Capital expenditures		78,223		16,682		137,647	38,890
Palmarejo [Member]
Financial information relating to reporting segments
Amortization		8,271		7,270		17,330	20,445
Other operating expenses		1,453		3,179		2,723	3,901
Loss on debt extinguishments						0
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(149)		(311)		(336)	(466)
Other, net		(371)		(1,651)		(1,036)	(1,698)
Income and mining tax (expense) benefit		(7,559)		(3,384)		(18,899)	(1,097)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		23,479		2,447		45,622	27,508
Assets, Net	[1]	307,287		307,215		307,287	307,215
Capital expenditures		9,795		4,533		19,778	11,613
Rochester [Member]
Financial information relating to reporting segments
Amortization		6,506		3,012		10,083	5,916
Other operating expenses		1,444		1,213		2,892	2,459
Loss on debt extinguishments						0
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(480)		(300)		(702)	(568)
Other, net		(92)		(25)		(153)	(78)
Income and mining tax (expense) benefit		(33)		0		(171)	(43)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(9,437)		(4,087)		(6,631)	(6,372)
Assets, Net	[1]	435,257		307,221		435,257	307,221
Capital expenditures		42,272		5,803		72,449	10,861
Kensington
Financial information relating to reporting segments
Amortization		12,710		12,853		26,155	24,775
Other operating expenses		2,273		3,519		5,268	3,850
Loss on debt extinguishments						0
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(142)		(214)		(374)	(523)
Other, net		(42)		(36)		(42)	35
Income and mining tax (expense) benefit		(707)		(474)		(1,041)	(474)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		2,425		5,122		7,382	12,018
Assets, Net	[1]	158,456		180,290		158,456	180,290
Capital expenditures		6,045		3,909		13,247	8,717
Wharf [Member]
Financial information relating to reporting segments
Amortization		2,994		3,181		5,469	5,625
Other operating expenses		525		(118)		710	324
Loss on debt extinguishments						0
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(46)		(50)		(83)	(101)
Other, net		628		(6)		652	(19)
Income and mining tax (expense) benefit		(1,294)		(1,701)		(2,423)	(2,176)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		15,182		13,066		27,130	17,688
Assets, Net	[1]	77,436		84,881		77,436	84,881
Capital expenditures		1,402		265		2,883	674
Silvertip [Member]
Financial information relating to reporting segments
Amortization		1,185		1,231		2,271	6,576
Other operating expenses		5,964		9,480		12,519	11,854
Loss on debt extinguishments						0
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		181		(220)		226	(479)
Other, net		(237)		424		(339)	1,554
Income and mining tax (expense) benefit		0		(255)		0	(255)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(10,800)		(13,664)		(21,430)	(36,537)
Assets, Net	[1]	189,489		159,995		189,489	159,995
Capital expenditures		18,525		1,949		28,912	6,565
Other Mining Properties [Member]
Financial information relating to reporting segments
Amortization		307		329		602	701
Other operating expenses		11,546		10,018		24,359	20,378
Loss on debt extinguishments						(9,173)
Fair value adjustments, net, pretax		37,239		10,067		33,440	1,248
Interest expense, net of capitalized interest		(4,457)		(4,670)		(8,734)	(8,756)
Other, net		815		1,415		5,246	2,208
Income and mining tax (expense) benefit		(5,747)		2,970		(5,592)	5,140
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		11,297		(4,093)		(17,867)	(27,414)
Assets, Net	[1]	171,517		169,273		171,517	169,273
Capital expenditures		184		223		378	460
Gold [Member]
Financial information relating to reporting segments
Revenue		146,158		127,902		284,480	255,507
Gold [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		41,232		23,669		78,799	65,316
Gold [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		14,026		8,982		26,466	17,648
Gold [Member] | Kensington
Financial information relating to reporting segments
Revenue		48,807		55,177		103,273	106,843
Gold [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		42,093		40,074		75,942	65,700
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		68,700		26,347		132,495	71,256
Product, Silver | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		43,802		14,301		86,580	46,993
Product, Silver | Rochester [Member]
Financial information relating to reporting segments
Revenue		24,059		11,661		44,376	22,400
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		839		385		1,539	633
Product, Silver | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0		0		0	1,230
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			(662)
Product, Zinc | Palmarejo [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Zinc | Rochester [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Zinc | Kensington
Financial information relating to reporting segments
Revenue				0			0
Product, Zinc | Wharf [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Zinc | Silvertip [Member]
Financial information relating to reporting segments
Revenue				0			(662)
Product, Zinc | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Lead
Financial information relating to reporting segments
Revenue				0			1,315
Product, Lead | Palmarejo [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Lead | Rochester [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Lead | Kensington
Financial information relating to reporting segments
Revenue				0			0
Product, Lead | Wharf [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Lead | Silvertip [Member]
Financial information relating to reporting segments
Revenue				0			1,315
Product, Lead | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue				0			0
Product, Metal [Member]
Financial information relating to reporting segments
Revenue		214,858		154,249		416,975	327,416
Product, Metal [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		85,034		37,970		165,379	112,309
Product, Metal [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		38,085		20,643		70,842	40,048
Product, Metal [Member] | Kensington
Financial information relating to reporting segments
Revenue		48,807		55,177		103,273	106,843
Product, Metal [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		42,932		40,459		77,481	66,333
Product, Metal [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0		0		0	1,883
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]	132,595		90,015		240,742	208,932
Product | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	41,918		18,825		75,906	54,799
Product | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	38,031		18,336		62,064	35,292
Product | Kensington
Financial information relating to reporting segments
Costs applicable to sales	[2]	29,203		30,382		60,597	60,889
Product | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	23,443		22,472		42,175	40,295
Product | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	0		0		0	17,657
Product | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	0		0		0	0
Mineral, Exploration
Financial information relating to reporting segments
Costs applicable to sales		12,446		11,855		22,112	18,241
Mineral, Exploration | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		1,834		903		3,527	2,395
Mineral, Exploration | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		936		1,844		1,408	2,064
Mineral, Exploration | Kensington
Financial information relating to reporting segments
Costs applicable to sales		1,305		2,577		2,414	4,349
Mineral, Exploration | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		76		101		143	105
Mineral, Exploration | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		3,595		2,902		6,527	3,153
Mineral, Exploration | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales		$ 4,700		$ 3,528		$ 8,093	$ 6,175

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

[2] Excludes amortization.