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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Financial assets that are measured at fair value on a recurring basis      
Gold collar $ 1,073 $ 0 $ 0
Marketable equity securities 4,807 5,366 5,192
Total 5,880 5,366 5,192
Level 1 [Member]
     
Financial assets that are measured at fair value on a recurring basis      
Gold collar 0 0 0
Marketable equity securities 4,807 5,366 5,192
Total 4,807 5,366 5,192
Level 2 [Member]
     
Financial assets that are measured at fair value on a recurring basis      
Gold collar 1,073 0 0
Marketable equity securities 0 0 0
Total 1,073 0 0
Level 3 [Member]
     
Financial assets that are measured at fair value on a recurring basis      
Gold collar 0 0 0
Marketable equity securities 0 0 0
Total $ 0 $ 0 $ 0