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Property, plant and equipment - Interest and AFUDC Capitalized (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Schedule of Capitalization [Line Items] |  |
Total | $ 12,179 | $ 6,680
Non-regulated property |  |
Schedule of Capitalization [Line Items] |  |
Interest capitalized on non-regulated property | 4,538 | 2,268
Interest expense |  |
Schedule of Capitalization [Line Items] |  |
AFUDC capitalized on regulated property | 2,745 | 1,684
Interest, dividend and other income |  |
Schedule of Capitalization [Line Items] |  |
AFUDC capitalized on regulated property | $ 4,896 | $ 2,728

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