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Fair value measurements (Financial assets and liabilities measured at fair value on recurring basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Derivative assets, fair value | $ 10,383 | $ 3,303
Liabilities |  |
Derivative liabilities, fair value | 123,608 | 167,303
Recurring |  |
Assets |  |
Derivative assets, fair value | 10,383 | 3,303
Investment, at fair value |  | 12,110
Liabilities |  |
Derivative liabilities, fair value | 123,608 | 167,303
Recurring | Level 1 |  |
Assets |  |
Derivative assets, fair value | 0 | 0
Investment, at fair value |  | 12,110
Liabilities |  |
Derivative liabilities, fair value | 0 | 0
Recurring | Level 2 |  |
Assets |  |
Derivative assets, fair value | 10,383 | 3,303
Investment, at fair value |  | 0
Liabilities |  |
Derivative liabilities, fair value | 123,608 | 167,303
Recurring | Level 3 |  |
Assets |  |
Derivative assets, fair value | 0 | 0
Investment, at fair value |  | 0
Liabilities |  |
Derivative liabilities, fair value | $ 0 | $ 0

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