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Cash, cash equivalents, restricted cash and restricted investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents and Investments Items [Line Items]
Cash and cash equivalents	$ 525,991	$ 639,415
Restricted cash and cash equivalents	1,187,948	1,014,543
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,713,939	1,653,958	$ 713,337	$ 549,333
Restricted investments securing other reinsurance contracts	86,367	142,617
Cash, cash equivalents, restricted cash, restricted cash equivalents and restricted investments	1,800,306	1,796,575
Letter of Credit
Restricted Cash and Cash Equivalents and Investments Items [Line Items]
Restricted cash and cash equivalents	306,032	254,176
Restricted cash securing other reinsurance contracts
Restricted Cash and Cash Equivalents and Investments Items [Line Items]
Restricted cash and cash equivalents	$ 881,916	$ 760,367

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- Definition

Cash, cash equivalents, restricted cash, restricted cash equivalents and restricted investments

+ References

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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