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Fair value measurements (Carrying amounts and fair values of financial instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Derivative assets, fair value	$ 1,852	$ 11,664
Liabilities
Derivative liabilities, fair value	200,014	97,066
Carrying value
Assets
Cash and cash equivalents	2,382,655	1,121,396
Restricted cash	260,466	178,951
Derivative assets, fair value	1,852	11,664
Assets, Carrying value	2,644,973	1,312,011
Liabilities
Debt	30,829,449	29,624,266
Derivative liabilities, fair value	200,014	97,066
Liabilities, Carrying value	31,029,463	29,721,332
Fair value
Assets
Cash and cash equivalents	2,382,655	1,121,396
Restricted cash	260,466	178,951
Derivative assets, fair value	1,852	11,664
Assets, Carrying value	2,644,973	1,312,011
Liabilities
Debt	29,720,936	30,219,588
Derivative liabilities, fair value	200,014	97,066
Liabilities, Carrying value	29,920,950	30,316,654
Fair value | Level 1
Assets
Cash and cash equivalents	2,382,655	1,121,396
Restricted cash	260,466	178,951
Derivative assets, fair value	0	0
Assets, Carrying value	2,643,121	1,300,347
Liabilities
Debt	0	0
Derivative liabilities, fair value	0	0
Liabilities, Carrying value	0	0
Fair value | Level 2
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Derivative assets, fair value	1,852	11,664
Assets, Carrying value	1,852	11,664
Liabilities
Debt	29,720,936	30,219,588
Derivative liabilities, fair value	200,014	97,066
Liabilities, Carrying value	29,920,950	30,316,654
Fair value | Level 3
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Derivative assets, fair value	0	0
Assets, Carrying value	0	0
Liabilities
Debt	0	0
Derivative liabilities, fair value	0	0
Liabilities, Carrying value	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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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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