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Long-term investments - Income from Long-term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |
Fair value gain (loss) on investments | $ 559,701 | $ 278,084
Dividend and interest income from investments carried at fair value | 91,448 | 100,886
Equity method income (loss) | 209 | (9,108)
Interest and other income | 13,313 | 27,759
Income from long-term investments | 664,671 | 397,621
Atlantica |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair value gain (loss) on investments | 519,297 | 290,740
Dividend and interest income from investments carried at fair value | 74,604 | 69,307
Atlantica Yield Energy Solutions Canada Inc. |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair value gain (loss) on investments | 20,272 | (6,649)
Dividend and interest income from investments carried at fair value | 14,731 | 25,572
Atlantica share subscription agreement |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair value gain (loss) on investments | 20,015 | 0
San Antonio Water System |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair value gain (loss) on investments | 117 | (6,007)
Dividend and interest income from investments carried at fair value | $ 2,113 | $ 6,007

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