|
Goodwill, transmission system rights, power purchase agreements and development intangible assets and liabilities (Details 3) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended |
|---|---|
|
Dec. 31, 2012
|
|
| Weighted average remaining amortization period related to our intangible assets | |
| Weighted average remaining amortization period | 9 years |
|
Power Purchase Agreements
|
|
| Estimated future amortization | |
| 2013 | 60,199 |
| 2014 | 60,527 |
| 2015 | 56,802 |
| 2016 | 56,802 |
| 2017 | 56,802 |
| Weighted average remaining amortization period related to our intangible assets | |
| Weighted average remaining amortization period | 9 years |
|
Fuel Supply Agreements
|
|
| Estimated future amortization | |
| 2013 | (1,173) |
| 2014 | (1,173) |
| 2015 | (1,173) |
| 2016 | (1,173) |
| 2017 | (1,173) |
| Weighted average remaining amortization period related to our intangible assets | |
| Weighted average remaining amortization period | 10 years |