Summary of significant accounting policies (Details) $ in Thousands	6 Months Ended
Jun. 30, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Debt	$ 47,927,887	$ 50,204,678
Floating rate debt
Summary Of Significant Accounting Policies [Line Items]
Debt	8,600,000
Floating rate debt \| LIBOR
Summary Of Significant Accounting Policies [Line Items]
Debt	6,400,000
Long-term debt, maturity, after year one	5,600,000
Derivative, notional amount	$ 4,200,000
Floating rate debt \| One month LIBOR
Summary Of Significant Accounting Policies [Line Items]
Long-term debt, floating rate, duration	1 month
Floating rate debt \| Three month LIBOR
Summary Of Significant Accounting Policies [Line Items]
Long-term debt, floating rate, duration	3 months
Floating rate debt \| Six month LIBOR
Summary Of Significant Accounting Policies [Line Items]
Long-term debt, floating rate, duration	6 months
Floating rate derivative \| One month LIBOR
Summary Of Significant Accounting Policies [Line Items]
Long-term debt, floating rate, duration	1 month
Floating rate derivative \| Three month LIBOR
Summary Of Significant Accounting Policies [Line Items]
Long-term debt, floating rate, duration	3 months
Floating rate derivative \| Six month LIBOR
Summary Of Significant Accounting Policies [Line Items]
Long-term debt, floating rate, duration	6 months

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Nominal or face amount used to calculate payment on derivative.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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