Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014
Financial information relating to reporting segments
Revenue	$ 166,263	$ 164,562	$ 319,219		$ 324,195
Costs applicable to sales	119,097	118,687	234,160	[1]	225,583	[1]
Amortization	38,974	41,422	72,064		81,849
Exploration	3,579	5,153	7,845		9,370
Interest and other income, net	(2,821)	(116)	(3,817)		(2,100)
Interest expense, net	(10,734)	(12,310)	(21,499)		(25,365)
Loss on termination of revolving credit facility	0	0	0		(3,035)
Fair value adjustments, net	2,754	(8,282)	(2,130)		(19,717)
Income and mining tax benefit (expense)	260	(2,621)	192		2,068
Net income (loss)	(16,677)	(43,121)	(49,965)		(80,312)
Assets, Net	1,485,125		1,485,125				$ 1,084,257
Capital expenditures	23,677	15,356	41,297		27,292
Palmarejo [Member]
Financial information relating to reporting segments
Metal sales	38,875	72,446	78,269		140,434
Royalties	0	0	0		0
Revenue	38,875	72,446	78,269		140,434
Costs applicable to sales	30,112	49,551	64,603		93,126
Amortization	9,046	18,044	16,380		36,702
Exploration	1,837	1,637	2,960		2,642
Other operating expenses	324	325	638		622
Interest and other income, net	(505)	(1,202)	(1,608)		(2,772)
Interest expense, net	(844)	(2,771)	(2,184)		(5,595)
Fair value adjustments, net	429	(4,989)	(1,116)		(15,225)
Income and mining tax benefit (expense)	(837)	1,342	534		5,171
Net income (loss)	(2,527)	(4,731)	(11,754)		(11,079)
Assets, Net	657,448	1,133,851	657,448		1,133,851
Capital expenditures	10,723	5,589	19,907		9,331
San Bartolome [Member]
Financial information relating to reporting segments
Metal sales	23,366	29,078	44,913		56,632
Royalties	0	0	0		0
Revenue	23,366	29,078	44,913		56,632
Costs applicable to sales	19,157	20,695	38,284		39,595
Amortization	5,271	4,855	9,961		9,313
Exploration	43	57	79		82
Other operating expenses	241	194	485		335
Interest and other income, net	420	691	872		1,373
Interest expense, net	(293)	(11)	(574)		(31)
Fair value adjustments, net	0	0	0		0
Income and mining tax benefit (expense)	(195)	(2,204)	1,211		(4,969)
Net income (loss)	(1,024)	1,753	(4,809)		3,680
Assets, Net	173,451	309,565	173,451		309,565
Capital expenditures	994	1,711	1,943		3,152
Kensington [Member]
Financial information relating to reporting segments
Metal sales	42,468	29,018	86,506		65,079
Royalties	0	0	0		0
Revenue	42,468	29,018	86,506		65,079
Costs applicable to sales	27,452	23,218	56,871		51,749
Amortization	12,684	11,566	24,238		22,275
Exploration	432	1,636	2,094		2,680
Other operating expenses	526	199	761		390
Interest and other income, net	(14)	4	(18)		4
Interest expense, net	(57)	(53)	(120)		(75)
Fair value adjustments, net	0	0	0		0
Income and mining tax benefit (expense)	994	0	994		0
Net income (loss)	309	(7,650)	1,410		(12,086)
Assets, Net	197,241	331,151	197,241		331,151
Capital expenditures	4,714	3,989	8,859		8,700
Rochester [Member]
Financial information relating to reporting segments
Metal sales	36,340	31,193	80,371		55,347
Royalties	0	0	0		0
Revenue	36,340	31,193	80,371		55,347
Costs applicable to sales	24,392	24,381	55,785		39,089
Amortization	5,387	5,025	12,230		9,476
Exploration	501	738	1,223		1,912
Other operating expenses	307	844	1,448		2,189
Interest and other income, net	0	32	(40)		51
Interest expense, net	(205)	(261)	(430)		(266)
Fair value adjustments, net	1,137	(1,837)	(1,155)		(2,510)
Income and mining tax benefit (expense)	350	(419)	700		(419)
Net income (loss)	6,335	(2,280)	7,360		(463)
Assets, Net	190,704	206,665	190,704		206,665
Capital expenditures	5,915	3,956	9,170		4,915
Coeur Capital [Member]
Financial information relating to reporting segments
Metal sales	3,083	1,971	5,028		4,860
Royalties	1,758	856	3,759		1,843
Revenue	4,841	2,827	8,787		6,703
Costs applicable to sales	1,352	842	1,985		2,024
Amortization	2,619	1,419	4,770		3,121
Exploration	75	109	150		312
Other operating expenses	13	263	30		504
Interest and other income, net	(924)	(964)	(2,449)		(3,512)
Interest expense, net	0	0	0		0
Fair value adjustments, net	0	0	0		0
Income and mining tax benefit (expense)	623	263	24		(25)
Net income (loss)	(765)	(507)	(621)		(2,795)
Assets, Net	55,896	67,864	55,896		67,864
Capital expenditures	0	0	0		0
Other Mining Properties [Member]
Financial information relating to reporting segments
Metal sales	0	0	0		0
Royalties	0	0	0		0
Revenue	0	0	0		0
Costs applicable to sales	0	0	0		0
Amortization	476	513	994		962
Exploration	691	976	1,339		1,742
Other operating expenses	8,801	16,333	22,283		35,029
Interest and other income, net	(1,866)	389	(2,173)		(766)
Interest expense, net	(9,335)	(9,214)	(18,191)		(19,398)
Fair value adjustments, net	1,188	(1,456)	141		(1,982)
Income and mining tax benefit (expense)	1,469	(1,603)	3,243		2,310
Net income (loss)	(18,512)	(29,706)	(41,596)		(57,569)
Assets, Net	78,395	522,632	78,395		522,632
Capital expenditures	87	111	123		1,194
Wharf [Member]
Financial information relating to reporting segments
Metal sales	20,373		20,373
Royalties	0		0
Revenue	20,373		20,373
Costs applicable to sales	16,632		16,632
Amortization	3,491		3,491
Exploration	0		0
Other operating expenses	506		671
Interest and other income, net	37		54
Interest expense, net	0		0
Fair value adjustments, net	0		0
Income and mining tax benefit (expense)	274		(412)
Net income (loss)	(493)		45
Assets, Net	131,990		131,990
Capital expenditures	1,244		1,295
Total [Member]
Financial information relating to reporting segments
Metal sales	164,505	163,706	315,460		322,352
Royalties	1,758	856	3,759		1,843
Revenue	166,263	164,562	319,219
Costs applicable to sales	119,097	118,687	234,160
Amortization	38,974	41,422	72,064
Other operating expenses	10,718	18,158	26,316		39,069
Interest and other income, net	(2,852)	(1,050)	(5,362)		(5,622)
Net income (loss)	(16,677)	(43,121)			(80,312)
Assets, Net		2,571,728			2,571,728
Capital expenditures	23,677	15,356	41,297		27,292
United States [Member]
Financial information relating to reporting segments
Revenue			187,249		120,427
Sales Revenue, Goods, Net	99,180	60,212
Mexico [Member]
Financial information relating to reporting segments
Revenue			79,584		141,167
Sales Revenue, Goods, Net	39,443	72,657
San Bartolome [Member]
Financial information relating to reporting segments
Sales Revenue, Goods, Net	23,366
BOLIVIA
Financial information relating to reporting segments
Revenue			44,913		56,632
Sales Revenue, Goods, Net		29,078
Australia [Member]
Financial information relating to reporting segments
Revenue			5,028		4,860
Sales Revenue, Goods, Net	3,083	1,971
Other Foreign Countries [Member]
Financial information relating to reporting segments
Revenue			2,445		$ 1,109
Sales Revenue, Goods, Net	$ 1,191	$ 644
Accumulated Deficit [Member]
Financial information relating to reporting segments
Net income (loss)			$ (49,965)

[1] Excludes amortization.