Commitment and Contigencies (Details Textual) (USD $)	3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended			0 Months Ended	6 Months Ended
	Jun. 30, 2013 Agreements oz	Jun. 30, 2013 oz	Dec. 31, 2012	Jan. 21, 2009	Jun. 30, 2013 Rochester [Member]	Mar. 31, 2012 Rochester [Member]	Jun. 30, 2013 Rochester [Member]	Jun. 30, 2012 Rochester [Member]	Jul. 07, 1995 Echo Bay [Member] oz	Jun. 30, 2013 Kensington [Member]	Jul. 07, 1995 Kensington [Member]	Jul. 07, 1995 Coeur Alaska Inc [Member]	Jun. 24, 2013 Settlement of Mining Claims [Member]	Jun. 30, 2013 Settlement of Mining Claims [Member]	Jun. 30, 2013 Palmarejo gold production royalty [Member] oz
Commitment and Contingencies (Textual) [Abstract]
Acquisition of ownership interest									50.00%		100.00%
Volume related to net smelter return royalty of future gold production									1,000,000
Purchase price and construction and development expenses												$ 32,500,000
Minimum royalty range for gold price per ounce										1.00%
Gold price per ounce for minimum royalty range										400
Maximum royalty range for gold price per ounce					5.00%					2.50%
Gold price per ounce for maximum royalty range					23.60					475
Royalty expenses					0	500,000	1,000,000	1,100,000
Further Payment Made on Number of Additional Ounces of Gold	170,382	170,382													170,382
NSR royalty percentage													3.40%	3.40%
NSR royalty maximum amount													39,400,000	39,400,000
Restructuring and related cost, expected cost		1,700,000
Additional Commitment and Contingencies (Textual) [Abstract]
Number of labor agreements in South America	1
Percentage of labor force covered by collective bargaining agreements	10.20%	10.20%
Accrued obligations postemployment benefits	$ 7,300,000	$ 7,300,000	$ 7,600,000
Royalty to be capped in terms of ounces of production	1,000,000
Purchased royalty				50.00%
Royalty agreement minimum obligation for the period	400,000
Royalty Agreement Minimum Obligation for Per Month	4,167
Royalty Agreement Period				8 years