Acquisitions (Details) (Campo Verde Solar LLC [Member], Southern Power [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	Apr. 23, 2013	Jun. 30, 2013 MW
Acquisitions (Textual) [Abstract]
Power of solar polycrystalline silicon facility		139
Beginning year of output of constructed plant		2013
Life Output Of Plant		20 years
Cash Consideration for acquisition of the interests in Apex	$ 136.6
Business Acquisition Cost Paid At Closing	111.6
Business Acquisition Cost Paid Upon Achievement Of Milestones	25.0
Minimum [Member]
Acquisitions (Textual) [Abstract]
Cash Consideration will be paid under MIPA	353
Maximum [Member]
Acquisitions (Textual) [Abstract]
Cash Consideration will be paid under MIPA	$ 363