Fair Value Measurements Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Convertible Senior Notes Due March 2028 [Member]	Dec. 31, 2012 Convertible Senior Notes Due March 2028 [Member]	Dec. 31, 2013 Senior Notes due 2021 [Member]	Jan. 29, 2013 Senior Notes due 2021 [Member]	Dec. 31, 2013 Palmarejo [Member]	Dec. 31, 2013 Rochester [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected Royalty Duration, Rochester								2 years 6 months	5 years 1 month 6 days
Liabilities, Fair Value Disclosure	$ 63,558	$ 154,397								$ 61,968	$ 0
Impairment of Long-Lived Assets Held-for-use	$ 772,993	$ 5,825	$ 0
Debt Instrument, Interest Rate, Stated Percentage				3.25%	3.25%	7.875%	7.875%