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Business Segment Information Business Segment Information - Revenue (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Revenue from External Customer [Line Items] | |||||||||||
| Revenues | $ 181,061 | $ 168,891 | $ 142,558 | $ 100,731 | $ 176,134 | $ 161,648 | $ 126,253 | $ 110,136 | $ 593,241 | $ 574,171 | $ 631,171 |
| Projects | |||||||||||
| Revenue from External Customer [Line Items] | |||||||||||
| Revenues | 388,327 | 388,142 | 462,555 | ||||||||
| Generating Assets | |||||||||||
| Revenue from External Customer [Line Items] | |||||||||||
| Revenues | 52,168 | 42,265 | 40,455 | ||||||||
| Operations and Maintenance | |||||||||||
| Revenue from External Customer [Line Items] | |||||||||||
| Revenues | 57,177 | 55,644 | 51,247 | ||||||||
| Integrated-PV Solar Products and Systems | |||||||||||
| Revenue from External Customer [Line Items] | |||||||||||
| Revenues | 52,508 | 48,869 | 45,261 | ||||||||
| All Other | |||||||||||
| Revenue from External Customer [Line Items] | |||||||||||
| Revenues | $ 43,061 | $ 39,251 | $ 31,653 | ||||||||