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Equity method and other investments - Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 01, 2019 | Aug. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Equity investment income |  |  | $ 3,936 | $ (3,824) | $ 11,158 | $ 6,126
Partnership Capital Contribution Scheduled Date |  | Aug. 01, 2019 |  |  |  |
Valuation Adjustment |  |  |  |  | $ 1,938 | $ 0
Minimum |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Current economic interest in the APAC JV, Owned by the Parent Company |  |  | 30.00% |  | 30.00% |
Maximum |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Current economic interest in the APAC JV, Owned by the Parent Company |  |  | 50.00% |  | 50.00% |
Forecast |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Partnership Capital Contribution Deferred Date | Dec. 01, 2019 |  |  |  |  |

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