Segment Reporting (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financial information relating to reporting segments
Revenue		$ 162,123		$ 169,987		$ 316,993	$ 333,254
Amortization		43,204		29,459		85,080	60,236
Other operating expenses		12,084		11,270		25,992	24,299
Fair value adjustments, net, pretax		(5,296)		(2,462)		3,824	2,192
Interest expense, net of capitalized interest		(6,825)		(6,018)		(13,279)	(11,983)
Other, net		643		544		703	1,057
Income and mining tax (expense) benefit		5,546		(3,717)		14,204	(15,666)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(36,764)		2,930		(61,658)	3,621
NET INCOME (LOSS)		(36,764)	$ (19,201)	2,930	$ 1,241	(55,965)	4,171
Income (loss) from discontinued operations		0		0		5,693	550
Assets, Net	[1]	1,535,465		1,447,904		1,535,465	1,447,904	$ 1,550,671
Capital expenditures		20,749		41,165		48,187	83,510
Palmarejo [Member]
Financial information relating to reporting segments
Amortization		14,212		14,633		28,740	30,958
Other operating expenses		1,769		750		2,471	1,481
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(112)		(147)		(248)	(266)
Other, net		(574)		755		(1,614)	(1,389)
Income and mining tax (expense) benefit		(345)		(3,646)		946	(16,089)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		4,674		18,815		8,530	22,024
Income (loss) from discontinued operations		0		0		0	0
Assets, Net	[1]	357,415		373,310		357,415	373,310
Capital expenditures		7,566		9,479		16,242	18,772
Rochester [Member]
Financial information relating to reporting segments
Amortization		3,963		4,793		8,000	9,624
Other operating expenses		1,346		903		2,308	1,787
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(170)		(125)		(312)	(223)
Other, net		43		466		16	426
Income and mining tax (expense) benefit		(814)		(463)		(670)	(834)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(5,587)		3,187		(6,785)	6,122
Income (loss) from discontinued operations		0		0		0	0
Assets, Net	[1]	274,406		253,638		274,406	253,638
Capital expenditures		2,772		669		7,417	3,302
Kensington [Member]
Financial information relating to reporting segments
Amortization		12,537		6,441		24,264	13,158
Other operating expenses		410		327		681	648
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(310)		(231)		(539)	(474)
Other, net		(16)		(33)		(3)	(70)
Income and mining tax (expense) benefit		0		0		0	0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		731		(6,919)		(3,853)	(8,157)
Income (loss) from discontinued operations		0		0		0	0
Assets, Net	[1]	214,096		215,753		214,096	215,753
Capital expenditures		5,020		10,708		14,231	22,072
Wharf [Member]
Financial information relating to reporting segments
Amortization		2,225		3,353		4,906	6,010
Other operating expenses		753		688		1,417	1,353
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(28)		(11)		(49)	(23)
Other, net		239		64		325	43
Income and mining tax (expense) benefit		(304)		(1,036)		(477)	(1,675)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		1,706		5,558		4,903	9,678
Income (loss) from discontinued operations		0		0		0	0
Assets, Net	[1]	104,070		99,878		104,070	99,878
Capital expenditures		171		1,162		602	1,506
Silvertip [Member]
Financial information relating to reporting segments
Amortization		9,878		0		18,304	0
Other operating expenses		386		5		627	25
Fair value adjustments, net, pretax		0		0		0	0
Interest expense, net of capitalized interest		(390)		(246)		(587)	(656)
Other, net		(33)		60		(221)	422
Income and mining tax (expense) benefit		7,589		943		17,340	1,778
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(17,983)		646		(32,783)	1,413
Income (loss) from discontinued operations		0		0		0	0
Assets, Net	[1]	415,333		390,155		415,333	390,155
Capital expenditures		4,875		19,045		9,097	37,674
Other Mining Properties [Member]
Financial information relating to reporting segments
Amortization		389		239		866	486
Other operating expenses		7,420		8,597		18,488	19,005
Fair value adjustments, net, pretax		(5,296)		(2,462)		3,824	2,192
Interest expense, net of capitalized interest		(5,815)		(5,258)		(11,544)	(10,341)
Other, net		984		(768)		2,200	1,625
Income and mining tax (expense) benefit		(580)		485		(2,935)	1,154
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(20,305)		(18,357)		(31,670)	(27,459)
Income (loss) from discontinued operations		0		0		5,693	550
Assets, Net	[1]	170,145		115,170		170,145	115,170
Capital expenditures		345		102		598	184
Gold [Member]
Financial information relating to reporting segments
Revenue		110,326		117,213		217,090	227,687
Gold [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		33,916		36,258		65,516	72,327
Gold [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		11,195		15,599		22,248	30,455
Gold [Member] | Kensington [Member]
Financial information relating to reporting segments
Revenue		45,161		35,735		85,447	72,035
Gold [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		20,054		29,621		43,879	52,870
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 [Member]
Financial information relating to reporting segments
Revenue		44,963		52,774		85,077	105,567
Product, Silver [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		25,406		34,486		47,031	68,454
Product, Silver [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		14,257		18,069		29,574	36,710
Product, Silver [Member] | Kensington [Member]
Financial information relating to reporting segments
Revenue		0		0		0	0
Product, Silver [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		189		219		406	403
Product, Silver [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		5,111		0		8,066	0
Product, Silver [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0		0		0	0
Product, Zinc [Member]
Financial information relating to reporting segments
Revenue		2,604				8,238
Product, Zinc [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Zinc [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Zinc [Member] | Kensington [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Zinc [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Zinc [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		2,604				8,238
Product, Zinc [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Lead [Member]
Financial information relating to reporting segments
Revenue		4,230				6,588
Product, Lead [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Lead [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Lead [Member] | Kensington [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Lead [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Lead [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		4,230				6,588
Product, Lead [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0				0
Product, Metal [Member]
Financial information relating to reporting segments
Revenue		162,123		169,987		316,993	333,254
Product, Metal [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Revenue		59,322		70,744		112,547	140,781
Product, Metal [Member] | Rochester [Member]
Financial information relating to reporting segments
Revenue		25,452		33,668		51,822	67,165
Product, Metal [Member] | Kensington [Member]
Financial information relating to reporting segments
Revenue		45,161		35,735		85,447	72,035
Product, Metal [Member] | Wharf [Member]
Financial information relating to reporting segments
Revenue		20,243		29,840		44,285	53,273
Product, Metal [Member] | Silvertip [Member]
Financial information relating to reporting segments
Revenue		11,945		0		22,892	0
Product, Metal [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		0		0		0	0
Product [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	131,948		108,246		263,598	207,586
Product [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	36,496		30,310		69,740	61,406
Product [Member] | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	24,693		24,451		47,147	48,756
Product [Member] | Kensington [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	29,133		34,227		61,308	62,857
Product [Member] | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	15,466		19,258		32,858	34,567
Product [Member] | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	26,160		0		52,545	0
Product [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales	[2]	0		0		0	0
Mineral, Exploration [Member]
Financial information relating to reporting segments
Costs applicable to sales		5,719		6,429		9,433	13,112
Mineral, Exploration [Member] | Palmarejo [Member]
Financial information relating to reporting segments
Costs applicable to sales		1,140		3,198		2,150	7,168
Mineral, Exploration [Member] | Rochester [Member]
Financial information relating to reporting segments
Costs applicable to sales		96		212		186	245
Mineral, Exploration [Member] | Kensington [Member]
Financial information relating to reporting segments
Costs applicable to sales		2,024		1,395		2,505	2,985
Mineral, Exploration [Member] | Wharf [Member]
Financial information relating to reporting segments
Costs applicable to sales		0		0		0	10
Mineral, Exploration [Member] | Silvertip [Member]
Financial information relating to reporting segments
Costs applicable to sales		670		106		731	106
Mineral, Exploration [Member] | Other Mining Properties [Member]
Financial information relating to reporting segments
Costs applicable to sales		$ 1,789		$ 1,518		$ 3,861	$ 2,598

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

[2] Excludes amortization.