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Acquisitions (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
May 27, 2014
Apr. 16, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Business Acquisition [Line Items]            
Shares Issued for Acquisition   11,572,918        
Share Price for Acquisition   $ 14,980        
Business Acquisition, Effective Date of Acquisition May 27, 2014 Apr. 16, 2013        
Payments to Acquire Royalty Interests in Mining Properties $ 2,200,000   $ 12,345,000 $ 15,480,000 $ 27,028,000 $ 30,929,000
La Preciosa Net Smelter Royalty 1.25%          
Payments for Royalties 1,800,000          
Business Acquisition, Date of Acquisition Agreement Sep. 02, 2014          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   3,487,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets   635,000        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned   173,363,000        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Fair Value Method   99059        
Business Combination, Consideration Transferred, Other   5,777,000        
Business Combination, Consideration Transferred, Fees and Expenses Paid   17,642,000        
Business Combination, Consideration Transferred   295,841,000        
Business Combination, Consideration Transferred, Liabilities Assumed, Current   2,616,000        
Business Combination, Consideration Transferred, Deferred Income Taxes Assumed   114,339,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   116,955,000        
Business Combination, Consideration Transferred, Cost of Acquired Entity   412,796,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Mineral Interests   408,352,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets   322,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   $ 412,796,000        
Warrants Issued for Acquisition   1,588,768        
Warrant Price for Acquisition   $ 3,640