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Shareholders' Equity And Comprehensive Income (Narrative) (Details)
Sep. 30, 2011
Bloom Lake [Member]
 
Percent ownership interest75.00%
Tilden [Member]
 
Percent ownership interest85.00%
Empire [Member]
 
Percent ownership interest79.00%
RenewaFUEL [Member]
 
Percent ownership interest95.00%[1]
[1] On September 27, 2011, we announced our plans to cease the operations of renewaFUEL. See the Discontined Operations disclosure below for further details.