Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Net Income (Loss) Attributable to Coeur Stockholders
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (270,961)	$ (14,277)	$ (36,764)	$ (24,894)	$ 468	$ (53,044)	$ 2,930	$ 691	$ (346,896)		$ (48,955)		$ 10,925
Income (loss) from discontinued operations	0	0	0	5,693	0	0	0	550	5,693		550		(12,244)
NET INCOME (LOSS)	$ (270,961)	$ (14,277)	$ (36,764)	$ (19,201)	$ 468	$ (53,044)	$ 2,930	$ 1,241	$ (341,203)		$ (48,405)		$ (1,319)
Weighted Average Number of Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic									218,812,000		188,606,000		180,096,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									0		0		4,048,000
Weighted Average Number of Shares Outstanding, Diluted									218,812,000		188,606,000		184,144,000
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share	$ (1.13)	$ (0.06)	$ (0.18)	$ (0.12)	$ 0	$ (0.29)	$ 0.02	$ 0	$ (1.59)		$ (0.26)		$ 0.06
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.00	0.00	0.00	0.03	0	0	0	0	0.03		0		(0.07)
Earnings Per Share, Basic	(1.13)	(0.06)	(0.18)	(0.09)	0	(0.29)	0.02	0	(1.56)	[1]	(0.26)	[1]	(0.01)	[1]
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share	(1.13)	(0.06)	(0.18)	(0.12)	0	(0.29)	0.02	0	(1.59)		(0.26)		0.06
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.00	0.00	0.00	0.03	0	0	0	0	0.03		0		(0.07)
Earnings Per Share, Diluted	$ (1.13)	$ (0.06)	$ (0.18)	$ (0.09)	$ 0	$ (0.29)	$ 0.02	$ 0	$ (1.56)	[1]	$ (0.26)	[1]	$ (0.01)	[1]
Stock Options
Earnings Per Share (Textual) [Abstract]
Number of antidilutive shares of common stock equivalents									1,137,726		1,312,737		653,354

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