Commitments, Contingencies And Uncertainties (Power Purchase and Sale Contracts) (Details)	0 Months Ended	9 Months Ended	0 Months Ended	3 Months Ended
	May 31, 2013 Macho Springs Solar MW	Sep. 30, 2013 Macho Springs Solar	Sep. 05, 2013 Newman Solar MW	Sep. 30, 2013 Newman Solar
Long-term Contract for Purchase of Electric Power [Line Items]
Plant Capacity	50		10
Long-term Purchase Commitment, Time Period		P20Y		P30Y
Projected Plant Commercial Operation Date		May 01, 2014		Dec. 31, 2014