Segment Reporting (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Financial information relating to reporting segments
Revenue		$ 173,167	$ 154,870
Amortization		36,162	41,876
Other operating expenses		15,475	13,908
Fair value adjustments, net, pretax		(8,819)	9,120
Interest expense, net of capitalized interest		(5,128)	(6,454)
Other, net		1,881	60
Income and mining tax (expense) benefit		3,939	8,658
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(11,900)	(24,894)
NET INCOME (LOSS)		(11,900)	(19,201)
Income (loss) from discontinued operations		0	5,693
Assets, Net	[1]	1,203,594	1,548,399	$ 1,215,783
Capital expenditures		22,208	27,438
Palmarejo [Member]
Financial information relating to reporting segments
Amortization		13,175	14,528
Other operating expenses		722	702
Fair value adjustments, net, pretax		0	0
Interest expense, net of capitalized interest		(155)	(136)
Other, net		(47)	(1,040)
Income and mining tax (expense) benefit		2,287	1,291
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		25,061	3,856
Income (loss) from discontinued operations		0	0
Assets, Net	[1]	307,662	360,734
Capital expenditures		7,080	8,676
Rochester [Member]
Financial information relating to reporting segments
Amortization		2,904	4,037
Other operating expenses		1,246	962
Fair value adjustments, net, pretax		0	0
Interest expense, net of capitalized interest		(268)	(142)
Other, net		(53)	(27)
Income and mining tax (expense) benefit		(43)	144
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(2,285)	(1,198)
Income (loss) from discontinued operations		0	0
Assets, Net	[1]	295,972	271,403
Capital expenditures		5,058	4,645
Kensington
Financial information relating to reporting segments
Amortization		11,922	11,727
Other operating expenses		331	271
Fair value adjustments, net, pretax		0	0
Interest expense, net of capitalized interest		(309)	(229)
Other, net		71	13
Income and mining tax (expense) benefit		0	0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		6,896	(4,584)
Income (loss) from discontinued operations		0	0
Assets, Net	[1]	188,470	221,164
Capital expenditures		4,808	9,356
Wharf [Member]
Financial information relating to reporting segments
Amortization		2,444	2,681
Other operating expenses		442	664
Fair value adjustments, net, pretax		0	0
Interest expense, net of capitalized interest		(51)	(21)
Other, net		(13)	86
Income and mining tax (expense) benefit		(475)	(173)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		4,622	3,197
Income (loss) from discontinued operations		0	0
Assets, Net	[1]	85,531	103,579
Capital expenditures		409	431
Silvertip [Member]
Financial information relating to reporting segments
Amortization		5,345	8,426
Other operating expenses		2,374	241
Fair value adjustments, net, pretax		0	0
Interest expense, net of capitalized interest		(259)	(197)
Other, net		1,130	(188)
Income and mining tax (expense) benefit		0	9,751
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(22,873)	(14,800)
Income (loss) from discontinued operations		0	0
Assets, Net	[1]	161,214	417,089
Capital expenditures		4,616	4,077
Other Mining Properties [Member]
Financial information relating to reporting segments
Amortization		372	477
Other operating expenses		10,360	11,068
Fair value adjustments, net, pretax		(8,819)	9,120
Interest expense, net of capitalized interest		(4,086)	(5,729)
Other, net		793	1,216
Income and mining tax (expense) benefit		2,170	(2,355)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(23,321)	(11,365)
Income (loss) from discontinued operations		0	5,693
Assets, Net	[1]	164,745	174,430
Capital expenditures		237	253
Gold [Member]
Financial information relating to reporting segments
Revenue		127,605	106,764
Gold [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		41,647	31,600
Gold [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		8,666	11,053
Gold [Member] | Kensington
Financial information relating to reporting segments
Revenue		51,666	40,286
Gold [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		25,626	23,825
Gold [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		0	0
Gold [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0	0
Product, Silver
Financial information relating to reporting segments
Revenue		44,909	40,114
Product, Silver | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		32,692	21,625
Product, Silver | Rochester [Member]
Financial information relating to reporting segments
Revenue		10,739	15,317
Product, Silver | Kensington
Financial information relating to reporting segments
Revenue		0	0
Product, Silver | Wharf [Member]
Financial information relating to reporting segments
Revenue		248	217
Product, Silver | Silvertip [Member]
Financial information relating to reporting segments
Revenue		1,230	2,955
Product, Silver | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0	0
Product, Zinc
Financial information relating to reporting segments
Revenue		(662)	5,634
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		(662)	5,634
Product, Zinc | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0	0
Product, Lead
Financial information relating to reporting segments
Revenue		1,315	2,358
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		1,315	2,358
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		173,167	154,870
Product, Metal [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		74,339	53,225
Product, Metal [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		19,405	26,370
Product, Metal [Member] | Kensington
Financial information relating to reporting segments
Revenue		51,666	40,286
Product, Metal [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		25,874	24,042
Product, Metal [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		1,883	10,947
Product, Metal [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0	0
Product
Financial information relating to reporting segments
Costs applicable to sales	[2]	118,917	131,650
Product | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	35,974	33,244
Product | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	16,956	22,454
Product | Kensington
Financial information relating to reporting segments
Costs applicable to sales	[2]	30,507	32,175
Product | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	17,823	17,392
Product | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	17,657	26,385
Product | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	0	0
Mineral, Exploration
Financial information relating to reporting segments
Costs applicable to sales		6,386	3,714
Mineral, Exploration | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		1,492	1,010
Mineral, Exploration | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		220	90
Mineral, Exploration | Kensington
Financial information relating to reporting segments
Costs applicable to sales		1,772	481
Mineral, Exploration | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		4	0
Mineral, Exploration | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		251	61
Mineral, Exploration | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales		$ 2,647	$ 2,072

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

[2] Excludes amortization.