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Mineral Properties and Mine Development (Tables)
 12 Months Ended
Dec. 31, 2012
Mineral Properties [Abstract]  
Schedule Of Components Of Mineral Properties
Mineral properties and mine development at December 31, 2012 and 2011, consisted of the following: 
(In thousands)
 
2012
 
2011
Mineral Properties:
 
 
 
 
   Ontario, Canada
 
 
 
 
        Marathon property
 
$
184,609

 
$
172,649

           Land improvements
 
13,390

 
6,668

        Benton property
 
14,056

 
14,056

 San Juan, Argentina
 
 
 
 
        Altar property
 
392,387

 
403,095

Mine Development:
 
 
 
 
   Montana, United States of America
 
 
 
 
        Stillwater Mine
 
$
464,882

 
$
414,340

        East Boulder Mine
 
155,878

 
139,463

 
 
1,225,202

 
1,150,271

   Less accumulated depletion and amortization
 
(325,977
)
 
(285,237
)
        Total mineral properties and mine development
 
$
899,225

 
$
865,034