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Fair value measurements (Financial assets and liabilities measured at fair value on recurring basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Derivative assets	$ 3,303	$ 11,664
Liabilities
Derivative liabilities	167,303	97,066
Recurring
Assets
Investment, at fair value	12,110
Derivative assets	3,303	11,664
Liabilities
Derivative liabilities	167,303	97,066
Recurring | Level 1
Assets
Investment, at fair value	12,110
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring | Level 2
Assets
Investment, at fair value	0
Derivative assets	3,303	11,664
Liabilities
Derivative liabilities	167,303	97,066
Recurring | Level 3
Assets
Investment, at fair value	0
Derivative assets	0	0
Liabilities
Derivative liabilities	$ 0	$ 0

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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