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Long-term investments - Investments in Significant Partnerships and Joint Ventures (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Assets | $ 11,188,028 | $ 10,911,470
Liabilities | 6,332,841 | 6,173,099
APUC's investment carrying amount for the entities | 119,798 | 83,497
Investments in Significant Partnerships and Joint Ventures |  |
Schedule of Equity Method Investments [Line Items] |  |
Assets | 1,686,942 | 833,791
Liabilities | 1,496,166 | 697,751
Net assets | 190,776 | 136,040
Investments in Significant Partnerships and Joint Ventures | APUC |  |
Schedule of Equity Method Investments [Line Items] |  |
Net assets | 98,645 | 63,624
Difference between investment carrying amount and underlying equity in net assets(a) | 21,153 | 18,487
APUC's investment carrying amount for the entities | $ 119,798 | $ 82,111

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