Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020		Sep. 30, 2019
Net Income (Loss) Attributable to Coeur Stockholders
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 26,856			$ (14,277)			$ 13,747		$ (75,935)
Income (loss) from discontinued operations	0			0			0		5,693
NET INCOME (LOSS)	$ 26,856	$ (1,209)	$ (11,900)	$ (14,277)	$ (36,764)	$ (19,201)	$ 13,747		$ (70,242)
Weighted Average Number of Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic	240,983,000			225,860,000			240,729,000		212,098,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	2,866,000			0			1,277,000		0
Weighted Average Number of Shares Outstanding, Diluted	243,849,000			225,860,000			242,006,000		212,098,000
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.11			$ (0.06)			$ 0.06		$ (0.36)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0			0			0		0.03
Earnings Per Share, Basic	0.11			(0.06)			0.06	[1]	(0.33)	[1]
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share	0.11			(0.06)			0.06		(0.36)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0			0			0		0.03
Earnings Per Share, Diluted	$ 0.11			$ (0.06)			$ 0.06	[1]	$ (0.33)	[1]
Stock Options
Earnings Per Share (Textual) [Abstract]
Number of antidilutive shares of common stock equivalents	182,803			319,162			1,722,014		1,312,737

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