Summary of Significant Accounting Policies- Project Assets (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Dec. 31, 2014 |
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| Accounting Policies [Abstract] | |||||
| Interest costs capitalized | $ 134 | $ 0 | $ 248 | $ 395 | |
| Minimum qualifying operating period for prorated repayments of grants | 5 years | ||||
| Section 1603 grants | $ 3,727 | $ 0 | $ 3,727 | ||
| Deferred grant income | $ 8,567 | $ 8,567 | $ 8,842 | ||
| X | ||||||||||
- Definition Government Grant, Qualification Requirement, Prorated Repayment Effective Period from Date Placed in Service No definition available.
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- Definition Proceeds from Government Grants No definition available.
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- References No definition available.
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- Definition Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying amount as of the balance sheet date of unearned revenue or income not otherwise specified in the taxonomy which is expected to be taken into income after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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