Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Attributable to Coeur Stockholders
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		$ (53,044)	$ (11,728)	$ (49,423)	$ (3,424)
Income (loss) from discontinued operations		0	(4,924)	550	(5,520)
NET INCOME (LOSS)		$ (53,044)	$ (16,652)	$ (48,873)	$ (8,944)
Weighted Average Number of Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic		185,246,000	179,278,000	184,935,000	179,141,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		0	0	0	0
Weighted Average Number of Shares Outstanding, Diluted		185,246,000	179,278,000	184,935,000	179,141,000
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share		$ (0.286)	$ (0.065)	$ (0.267)	$ (0.019)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.000	(0.028)	0.003	(0.031)
Earnings Per Share, Basic	[1]	(0.286)	(0.093)	(0.264)	(0.050)
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share		(0.286)	(0.065)	(0.267)	(0.019)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		0.000	(0.028)	0.003	(0.031)
Earnings Per Share, Diluted	[1]	$ (0.286)	$ (0.093)	$ (0.264)	$ (0.050)
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of antidilutive shares of common stock equivalents		672,399	633,391	1,526,109	851,254

[1] Due to rounding, the sum of net income per share from continuing operations and discontinued operations may not equal net income per share.