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RESTRICTED CASH (Details) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 29, 2013
Tocqueville Bullion Reserve, Ltd.
Jan. 02, 2014
Tocqueville Bullion Reserve, Ltd.
Subsequent Event
Dec. 31, 2013
Self-insurance deposit
Dec. 31, 2012
Self-insurance deposit
Dec. 31, 2011
Qualified environmental trust fund
Dec. 31, 2013
Qualified environmental trust fund
Dec. 31, 2012
Qualified environmental trust fund
RESTRICTED CASH                  
Restricted cash $ 28,723,000 $ 25,450,000     $ 6,900,000 $ 4,700,000   $ 16,800,000 $ 20,700,000
Contribution to qualified environmental trust ("QET")             32,000,000    
Amount withdrawn from the trust to fund the environmental remediation expenditures               2,800,000 12,000,000
Amount deposited into restricted account     $ 5,000,000            
Number of shares acquired       5,000          
Purchase price (in dollars per shares)       $ 1,000