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Investments In Associated Companies (Las Cruces) (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2010
Aug. 31, 2005
Las Cruces [Member]
Dec. 31, 2010
Las Cruces [Member]
Dec. 31, 2011
Equity Method Associated Companies [Member]
Investments In Associated Companies [Line Items]        
Percentage of interest sold   70.00% 30.00%  
Cash from sale of investment     $ 150,000,000  
Newly issued Inmet common shares, consideration   5,600,000 5,442,413  
Aggregate consideration of interest sold     576,003,000  
Release of guarantee debt     72,000,000  
Gain on sale in investment 383,369,000   383,369,000  
Undistributed earnings       $ 40,325,000