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Fair value measurements (Carrying amounts and fair values of financial instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Derivative assets | $ 11,664 | $ 69,105
Liabilities |  |
Derivative liabilities (Note 11) | 97,066 | 29,321
Carrying value |  |
Assets |  |
Cash and cash equivalents | 1,121,396 | 1,204,018
Restricted cash | 178,951 | 211,017
Derivative assets | 11,664 | 69,105
Assets, Carrying value | 1,312,011 | 1,484,140
Liabilities |  |
Debt | 29,624,266 | 29,668,203
Derivative liabilities (Note 11) | 97,066 | 29,321
Liabilities, Carrying value | 29,721,332 | 29,697,524
Fair value |  |
Assets |  |
Cash and cash equivalents | 1,121,396 | 1,204,018
Restricted cash | 178,951 | 211,017
Derivative assets | 11,664 | 69,105
Assets, Carrying value | 1,312,011 | 1,484,140
Liabilities |  |
Debt | 30,219,588 | 29,031,153
Derivative liabilities (Note 11) | 97,066 | 29,321
Liabilities, Carrying value | 30,316,654 | 29,060,474
Fair value | Level 1 |  |
Assets |  |
Cash and cash equivalents | 1,121,396 | 1,204,018
Restricted cash | 178,951 | 211,017
Derivative assets | 0 | 0
Assets, Carrying value | 1,300,347 | 1,415,035
Liabilities |  |
Debt | 0 | 0
Derivative liabilities (Note 11) | 0 | 0
Liabilities, Carrying value | 0 | 0
Fair value | Level 2 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Derivative assets | 11,664 | 69,105
Assets, Carrying value | 11,664 | 69,105
Liabilities |  |
Debt | 30,219,588 | 29,031,153
Derivative liabilities (Note 11) | 97,066 | 29,321
Liabilities, Carrying value | 30,316,654 | 29,060,474
Fair value | Level 3 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Derivative assets | 0 | 0
Assets, Carrying value | 0 | 0
Liabilities |  |
Debt | 0 | 0
Derivative liabilities (Note 11) | 0 | 0
Liabilities, Carrying value | $ 0 | $ 0

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