Acquisitions (Details) (USD $)	0 Months Ended		3 Months Ended		9 Months Ended		0 Months Ended
	May 27, 2014	Apr. 16, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 02, 2014 La Preciosa [Member]
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		$ 11,351,000	$ 12,619,000	$ 38,379,000	$ 43,548,000
La Preciosa Net Smelter Royalty	1.25%						3.00%
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					12,000,000
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