Acquisitions Additional Information (Details)
$ in Millions |
|
3 Months Ended |
9 Months Ended |
|
May 15, 2015
USD ($)
MW
|
Sep. 30, 2015
USD ($)
|
Sep. 30, 2015
USD ($)
|
| Lost Creek, Post Rock, Logan's Gap, Panhandle 2, Panhandle 1, and El Arrayán [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| BusinessCombinationAcquisitionRelatedCredits |
|
$ 0.2
|
|
| Acquisition related expenses |
|
|
$ 1.7
|
| Lost Creek Wind Finco LLC [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Percentage of voting interests acquired |
100.00%
|
|
|
| LincoIn County Wind Project Holdco Llc [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Percentage of voting interests acquired |
100.00%
|
|
|
| Lost Creek Wind Holdco LLC [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Percentage of voting interests acquired |
100.00%
|
|
|
| Lost Creek Wind Project [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Percentage of voting interests acquired |
100.00%
|
|
|
| Lost Creek Finco and Lincoln County Holdco [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Percentage of voting interests acquired |
100.00%
|
|
|
| Consideration |
$ 242.0
|
|
|
| Lost Creek Wind Project [Member] | Lost Creek Wind Finco LLC [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Generating capacity | MW |
150
|
|
|
| Post Rock Wind Project [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Percentage of ownership |
100.00%
|
|
|
| Post Rock Wind Project [Member] | LincoIn County Wind Project Holdco Llc [Member] |
|
|
|
| Business Acquisition [Line Items] |
|
|
|
| Generating capacity | MW |
201
|
|
|