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SHAREHOLDERS' EQUITY (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Feb. 12, 2016
USD ($)
$ / shares
Oct. 01, 2015
USD ($)
shares
Aug. 17, 2015
USD ($)
$ / shares
Jun. 18, 2015
$ / shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
item
shares
Dec. 31, 2015
USD ($)
shares
Exchangeable shares converted into common stock         3,200,000 900,000  
Exchangeable, shares outstanding         21,054,000 27,600,000 24,213,000
Common stock issued         277,022,000   274,421,000
Number of mining contractors with which the entity has entered into an agreement | item           1  
Semi-annual return of capital payable (in dollars per share) | $ / shares $ 0.005            
Return of capital distribution paid | $ $ 1,500   $ 1,500   $ 1,489    
Fair Value of common stock at issuance | $           $ 400  
Share repurchase program | $         $ 582   $ 1,800
Number of shares authorized to be repurchased   15,000,000          
Period of time over which common stock can be repurchased   12 months          
Authorized maximum to be spent on repurchases | $   $ 15,000          
Share repurchase program (in shares)         557,991   1,896,442
Settlement agreement regarding outstanding litigation              
Number of mining contractors with which the entity has entered into an agreement | item           1  
Common Stock              
Shares issued for settlement of accounts payable (in shares)           430,295  
Shares issued for settlement of accounts payable (in shares)           430,000  
Annual return of capital declared (in dollars per share) | $ / shares       $ 0.01      
Semi-annual return of capital payable (in dollars per share) | $ / shares     $ 0.005        
Share repurchase program | $         $ 582    
Share repurchase program (in shares)         558,000