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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Apr. 26, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
STOCK BASED COMPENSATION          
Stock option expense   $ 0.3 $ 0.3 $ 1.1 $ 0.8
Certain employees and directors          
STOCK BASED COMPENSATION          
Stock options granted (in shares)       0.4 0.6
Weighted average exercise price       $ 2.78 $ 3.99
Vesting period of options       3 years 3 years
Exercisable period of options       5 years 5 years
Lexam          
STOCK BASED COMPENSATION          
Share replacement awards $ 0.1     $ 0.1  
Ratio of Company's share for acquired company's share 0.056%     0.056%