Segment Reporting (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016
Financial information relating to reporting segments
Revenue		$ 206,138		$ 146,636
Royalty Revenue				1,751
Revenues		206,138		148,387
Costs applicable to sales	[1]	132,712		101,555
Amortization		40,104		27,964
Exploration		5,252		1,731
Write-downs		0		4,446
Other operating expenses		14,714		12,480
Fair value adjustments, net		(1,200)		(8,695)
Interest expense, net		(3,586)		(11,120)
Other, net		21,139		1,314
Income and mining tax benefit (expense)		(11,046)		(2,106)
Net income (loss)		18,663		(20,396)
Assets, Net		1,091,623		1,117,940	[2]	$ 1,122,038
Capital expenditures		23,979		22,172
Palmarejo [Member]
Financial information relating to reporting segments
Revenue		77,704		29,813
Royalty Revenue				0
Revenues				29,813
Costs applicable to sales		43,001		21,038	[3]
Amortization		20,150		7,289
Exploration		1,631		801
Write-downs				0
Other operating expenses		301		315
Fair value adjustments, net		0		(4,864)
Interest expense, net		(125)		734
Other, net		1,794		(1,235)
Income and mining tax benefit (expense)		(12,245)		(98)
Net income (loss)		2,045		(6,365)
Assets, Net		401,623	[4]	422,086	[2]
Capital expenditures		6,230		8,815
Rochester [Member]
Financial information relating to reporting segments
Revenue		38,979		29,982
Royalty Revenue				0
Revenues				29,982
Costs applicable to sales		26,439		22,485	[3]
Amortization		5,816		5,313
Exploration		144		109
Write-downs				0
Other operating expenses		810		681
Fair value adjustments, net		(1,200)		(2,249)
Interest expense, net		(117)		171
Other, net		(32)		3
Income and mining tax benefit (expense)		(498)		423
Net income (loss)		3,923		(1,446)
Assets, Net		227,526	[4]	209,692	[2]
Capital expenditures		10,568		3,289
Kensington [Member]
Financial information relating to reporting segments
Revenue		37,964		35,743
Royalty Revenue				0
Revenues				35,743
Costs applicable to sales		28,443		24,418	[3]
Amortization		9,178		8,349
Exploration		839		(47)
Write-downs				0
Other operating expenses		345		252
Fair value adjustments, net		0		0
Interest expense, net		(40)		43
Other, net		(808)		(20)
Income and mining tax benefit (expense)		0		0
Net income (loss)		(1,689)		2,708
Assets, Net		204,987	[4]	192,805	[2]
Capital expenditures		5,521		8,090
Wharf [Member]
Financial information relating to reporting segments
Revenue		30,251		27,929
Royalty Revenue				0
Revenues				27,929
Costs applicable to sales		16,320		15,461	[3]
Amortization		3,111		4,051
Exploration		0		0
Write-downs				0
Other operating expenses		619		493
Fair value adjustments, net		0		0
Interest expense, net		(19)		0
Other, net		89		10
Income and mining tax benefit (expense)		(957)		(116)
Net income (loss)		9,314		8,050
Assets, Net		104,673	[4]	113,383	[2]
Capital expenditures		887		1,410
San Bartolome [Member]
Financial information relating to reporting segments
Revenue		20,584		21,278
Royalty Revenue				0
Revenues				21,278
Costs applicable to sales		18,222		17,497	[3]
Amortization		1,411		1,754
Exploration		0		0
Write-downs				0
Other operating expenses		752		291
Fair value adjustments, net		0		0
Interest expense, net		(7)		3
Other, net		279		315
Income and mining tax benefit (expense)		(31)		1,571
Net income (loss)		440		477
Assets, Net		68,412	[4]	87,750	[2]
Capital expenditures		388		521
Other Mining Properties [Member]
Financial information relating to reporting segments
Revenue		656		1,891
Royalty Revenue				1,751
Revenues				3,642
Costs applicable to sales		287		656	[3]
Amortization		438		1,208
Exploration		2,638		868
Write-downs				4,446
Other operating expenses		11,887		10,448
Fair value adjustments, net		0		(1,582)
Interest expense, net		(3,278)		10,169
Other, net		19,817		2,241
Income and mining tax benefit (expense)		2,685		326
Net income (loss)		4,630		(23,820)
Assets, Net		84,402	[4]	92,224	[2]
Capital expenditures		$ 385		$ 47

[1] Excludes amortization.

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

[3] Excludes amortization

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