Shareholders' Equity and Comprehensive income (Narrative)	Jun. 30, 2011
Bloom Lake [Member]
Percentage Of Ownership Interests	75.00%
Tilden [Member]
Percentage Of Ownership Interests	85.00%
Empire [Member]
Percentage Of Ownership Interests	79.00%
renewaFUEL [Member]
Percentage Of Ownership Interests	95.00%