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

Specifies the time period covered by the arrangement.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration