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Equity method and other investments - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Noncontrolling Interest [Line Items] |  |
Equity investment income | $ 2,708 | $ 155
Valuation Adjustment | $ 0 |
Minimum |  |
Noncontrolling Interest [Line Items] |  |
Current economic interest in the APAC JV, Owned by the Parent Company | 30.00% |
Maximum |  |
Noncontrolling Interest [Line Items] |  |
Current economic interest in the APAC JV, Owned by the Parent Company | 50.00% |

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