Write-Downs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	$ 0	$ 4,446	$ 246,625
Mining Properties and Mineral Rights [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	0	4,446	227,921
Mining Properties and Mineral Rights [Member] | Palmarejo [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	0	0	205,803
Mining Properties and Mineral Rights [Member] | Coeur Capital [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	0	4,446	22,118
Property, Plant and Equipment, Other Types [Member] | Palmarejo [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	$ 0	$ 0	$ 18,704