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Long-term investments - Income from Long-term Investments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |
Fair value gain (loss) on investments | $ 278,084,000 | $ (137,957,000)
Dividend and interest income from investments | 100,886,000 | 39,263,000
Equity method loss | (9,108,000) | (3,082,000)
Interest and other income | 29,230,000 | 16,958,000
Income from long-term investments | 399,092,000 | (84,818,000)
Atlantica |  |
Investment [Line Items] |  |
Fair value gain (loss) on investments | 290,740,000 | (137,957,000)
Dividend and interest income from investments | 69,307,000 | 39,263,000
AYES Canada |  |
Investment [Line Items] |  |
Fair value gain (loss) on investments | (6,649,000) | 0
Dividend and interest income from investments | 25,572,000 | 0
San Antonio Water System |  |
Investment [Line Items] |  |
Fair value gain (loss) on investments | (6,007,000) | 0
Dividend and interest income from investments | $ 6,007,000 | $ 0

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