Write-Downs Write-Downs (Details Textual) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	$ 772,993,000	$ 5,825,000	$ 0
Palmarejo [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	642,100,000
Impairment, tax benefit	179,800,000
Kensington [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Write-downs	$ 130,700,000