Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income (Loss) Attributable to Coeur Stockholders
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		$ 468	$ (53,044)	$ 2,930	$ 691	$ 14,349	$ (11,728)	$ (9,995)	$ 18,299	$ (48,955)	$ 10,925	$ 22,435
Income (loss) from discontinued operations		0	0	0	550	(6,724)	(4,924)	(960)	364	550	(12,244)	32,917
NET INCOME (LOSS)		$ 468	$ (53,044)	$ 2,930	$ 1,241	$ 7,625	$ (16,652)	$ (10,955)	$ 18,663	$ (48,405)	$ (1,319)	$ 55,352
Weighted Average Number of Shares Outstanding
Weighted Average Number of Shares Outstanding, Basic										188,606,000	180,096,000	159,853,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements										0	4,048,000	3,606,000
Weighted Average Number of Shares Outstanding, Diluted										188,606,000	184,144,000	163,459,000
Basic EPS
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.00	$ (0.290)	$ 0.020	$ 0.000	$ 0.08	$ (0.060)	$ (0.050)	$ 0.100	$ (0.260)	$ 0.060	$ 0.140
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.00	0.000	0.000	0.000	(0.04)	(0.030)	(0.010)	0.000	0.000	(0.070)	0.210
Earnings Per Share, Basic	[1]	0.000	(0.290)	0.020	0.000	0.040	(0.090)	(0.060)	0.100	(0.260)	(0.010)	0.350
Diluted EPS
Income (Loss) from Continuing Operations, Per Diluted Share		0.000	(0.290)	0.020	0.000	0.080	(0.060)	(0.050)	0.100	(0.260)	0.060	0.140
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		0.000	0.000	0.000	0.000	(0.040)	(0.030)	(0.010)	0.000	0.000	(0.070)	0.200
Earnings Per Share, Diluted	[1]	$ 0.000	$ (0.290)	$ 0.020	$ 0.000	$ 0.040	$ (0.090)	$ (0.060)	$ 0.100	$ (0.260)	$ (0.010)	$ 0.340
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of antidilutive shares of common stock equivalents										1,321,242	653,354	386,771

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