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Goodwill Impairment (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 DPLER [Member] | Mar. 31, 2014 DPLER [Member] | Mar. 31, 2014 Buffalo Gap [Member] MW project
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 136,000,000 |
Goodwill implied fair value |  |  |  |  |  | 0 |
Goodwill impairment expense | $ 0 | $ 0 | $ 154,000,000 | $ 0 | $ 0 | $ 136,000,000 | $ 18,000,000
Number of wind projects |  |  |  |  |  |  | 3
Generation capacity mega watts |  |  |  |  |  |  | 524

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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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