Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income (Loss) Attributable to Coeur Stockholders
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 14,349	$ (11,728)	$ (9,995)	$ 18,299	$ (10,328)	$ 46,123	$ 8,280	$ (21,640)	$ 10,925	$ 22,435	$ (287,811)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(6,724)	(4,924)	(960)	364	2,020	23,436	6,217	1,244	(12,244)	32,917	(79,372)
Net income (loss)	$ 7,625	$ (16,652)	$ (10,955)	$ 18,663	$ (8,308)	$ 69,559	$ 14,497	$ (20,396)	$ (1,319)	$ 55,352	$ (367,183)
Weighted Average Number of Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic									180,096,000	159,853,000	129,639,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									4,048,000	3,606,000	0
Weighted Average Number of Shares Outstanding, Diluted									184,144,000	163,459,000	129,639,000
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.08	$ (0.06)	$ (0.05)	$ 0.10	$ (0.06)	$ 0.29	$ 0.05	$ (0.15)	$ 0.06	$ 0.14	$ (2.22)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.04)	(0.03)	(0.01)	0.00	0.01	0.14	0.04	0.01	(0.07)	0.21	(0.61)
Basic (in dollars per share)	0.04	(0.09)	(0.06)	0.10	(0.05)	0.43	0.09	(0.14)	(0.01)	0.35	(2.83)
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share	0.04	(0.09)	(0.06)	0.10	(0.05)	0.42	0.09	(0.14)	0.06	0.14	(2.22)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.08	(0.06)	(0.05)	0.10	(0.06)	0.28	0.05	(0.15)	(0.07)	0.20	(0.61)
Diluted (in dollars per share)	$ (0.04)	$ (0.03)	$ (0.01)	$ 0.00	$ 0.01	$ 0.14	$ 0.04	$ 0.01	$ (0.01)	$ 0.34	$ (2.83)
Convertible Senior Notes Due March 2028 [Member]
Earnings Per Share (Textual) [Abstract]
Stated interest rate											3.25%
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of shares of common stock equivalents related to convertible debt									653,354	386,771	3,239,425