Write-Downs (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 19, 2016
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	$ 0	$ 4,446	$ 246,625
Impairment of Long-Lived Assets Held-for-use, Net of Tax		3,900	209,800
Palmarejo [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs			224,500
Impairment of Long-Lived Assets Held-for-use, Net of Tax			193,500
Coeur Capital [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs			22,100
Impairment of Long-Lived Assets Held-for-use, Net of Tax			$ 16,300
Endeavor [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs		2,500
McEwen Mining Inc, El Gallo, Magistral Mine [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs		$ 1,900
Transfer of financial assets accounted for as sales, amount				$ 6,300
Disposition of Assets, Contingent Consideration, Asset				$ 1,000