Acquisition of Orko Silver Corporation/La Preciosa Mineral Interests (Details) (Orko Silver Corporation [Member], USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Apr. 16, 2013
Orko Silver Corporation [Member]
Business Combination, Consideration Transferred [Abstract]
Common shares issued (11,572,918 at $14.98)	$ 173,363
Cash	99,059
Warrants (1,588,768 valued at $3.64 per warrant)	5,777
Transaction advisory fees and other acquisition costs	17,642
Total purchase price	295,841
Current liabilities	2,616
Deferred income taxes	114,339
Total liabilities assumed	116,955
Total Consideration	412,796
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash	3,487
Other current assets	635
Mineral interests	408,352
Other assets	322
Total assets acquired	$ 412,796
Common shares issued for acquisition	11,572,918
Common shares issued, price per share	$ 14.98
Number of warrants issued	1,588,768
Warrants, price per warrant	$ 3.64