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Business acquisitions and development projects - Acquisition of Luning Solar Facility (Details) $ in Thousands | Feb. 15, 2017 USD ($) MWac | Dec. 31, 2016 USD ($)
--- | --- | ---
Luning Solar Facility |  |
Business Acquisition [Line Items] |  |
Business combination, purchase price | $ 110,856 |
Working capital | 152 |
Property, plant and equipment | 110,857 |
Asset retirement obligation | (546) |
Non-controlling interest (tax equity) | (38,633) |
Total net assets acquired | $ 71,830 |
Luning Solar Facility |  |
Business Acquisition [Line Items] |  |
Solar power capacity (megawatt ac) | MWac | 50 |
Partnership | Tax Investor | Luning Solar Facility |  |
Business Acquisition [Line Items] |  |
Partnership agreement, funded amount |  | $ 7,826

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