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Long-term investments - Investments in Significant Partnerships and Joint Ventures (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Assets | $ 10,911,470 | $ 9,398,589
APUC's investment carrying amount for the entities | 83,770 | 29,588
Investments in Significant Partnerships and Joint Ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Assets | 833,791 | 360,372
Liabilities | 697,751 | 335,331
Net assets | 136,040 | 25,041
APUC | Investments in Significant Partnerships and Joint Ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Net assets | 63,624 | 18,042
Difference between investment carrying amount and underlying equity in net assets(a) | 18,487 | 11,048
APUC's investment carrying amount for the entities | $ 82,111 | $ 29,090

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