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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions		1 Months Ended				3 Months Ended								12 Months Ended
	Feb. 21, 2019 USD ($) $ / shares	Nov. 30, 2018 $ / shares	Nov. 30, 2018 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2015 $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Retained earnings
Dividend per share						$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.30	$ 0.30	$ 1.60	$ 1.40
Grupo Mexico and Americas Mining
Retained earnings
Dividend per share	$ 0.44428
Settlement dividend paid | $	$ 36.5
Legal fees paid | $	$ 13.5
Peruvian Operations
Non-controlling interest
Investment shareholders' interest in Peruvian Branch (as a percent)						0.71%								0.71%
Employee Stock Purchase 2015 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)				$ 1.86	$ 38.44									$ 1.86
Percentage of title acquired by employee in every two years on shares paid in previous two years														50.00%
Period of plan														8 years
Ratio of bonus shares granted to participant														0.1
Stock based compensation expense | $														$ 0.6	$ 0.6	$ 0.6
Unrecognized compensation expense | $						$ 2.0				$ 2.6				$ 2.0	$ 2.6	$ 3.2
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares									1,840,336				2,293,120	1,840,336	2,293,120
Exercised (in shares) | shares														(460,602)	(452,784)
Outstanding shares at the end of the period | shares						1,379,734				1,840,336				1,379,734	1,840,336	2,293,120
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)									$ 2.63				$ 2.63	$ 2.63	$ 2.63
Exercised (in dollars per share)														2.63	2.63
Outstanding shares at the end of the period (in dollars per share)						$ 2.63				$ 2.63				$ 2.63	$ 2.63	$ 2.63
Employee Stock Purchase 2018 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)		$ 1.86	$ 37.89
Percentage of title acquired by employee in every two years on shares paid in previous two years														50.00%
Period of plan														8 years
Ratio of bonus shares granted to participant														0.1
Stock based compensation expense | $														$ 0.7
Unrecognized compensation expense | $						$ 4.5								$ 4.5
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares									2,782,424					2,782,424
Granted (in shares) | shares														1,238,169	2,782,424
Exercised (in shares) | shares														(17,695)
Outstanding shares at the end of the period | shares						4,002,898				2,782,424				4,002,898	2,782,424
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)									$ 1.86					$ 1.86
Granted (in dollars per share)														1.86	$ 1.86
Exercised (in dollars per share)														1.86
Outstanding shares at the end of the period (in dollars per share)						$ 1.86				$ 1.86				$ 1.86	$ 1.86
Directors' Stock Award Plan
Information related to compensation cost
Stock based compensation expense | $														$ 0.4	$ 0.4
Stock award activity, Shares
Granted (in shares) | shares														14,400	16,000

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