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Equity method and other investments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Noncontrolling Interest [Line Items] |  |  |  |
Equity investment income (loss) | $ 5,496 | $ 3,936 | $ 27,681 | $ 11,158
Valuation Adjustment |  |  | $ 0 | $ 0
Parent Company |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership interest percentage by parent | 75.00% |  | 75.00% |
Parent Company | Minimum |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership interest percentage by parent | 30.00% |  | 30.00% |
Parent Company | Maximum |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership interest percentage by parent | 50.00% |  | 50.00% |
APAC JV - Nonsolidated Unrelated Noncontrolling Investor |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Current economic interest in the APAC JV, Owned by Noncontrolling Investors | 25.00% |  | 25.00% |

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