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Long-term investments - Income from Long-term Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value gain (loss) on investments | $ 309,842 | $ 121,394 | $ 119,084 | $ 115,576
Dividend and interest income from investments carried at fair value | 24,304 | 35,156 | 47,682 | 50,533
Equity method loss | (1,326) | (2,620) | (2,124) | (4,726)
Interest and other income | 1,989 | 6,732 | 7,506 | 18,751
Income from long-term investments | 334,809 | 160,662 | 172,148 | 180,134
Atlantica |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value gain (loss) on investments | 305,606 | 136,809 | 120,212 | 130,991
Dividend and interest income from investments carried at fair value | 18,426 | 17,527 | 36,852 | 32,904
Atlantica Yield Energy Solutions Canada Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value gain (loss) on investments | 2,897 | (15,415) | (1,245) | (15,415)
Dividend and interest income from investments carried at fair value | 4,813 | 17,629 | 8,717 | 17,629
San Antonio Water System |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair value gain (loss) on investments | 1,339 | 0 | 117 | 0
Dividend and interest income from investments carried at fair value | $ 1,065 | $ 0 | $ 2,113 | $ 0

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