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Statutory financial information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices
Statutory net income (loss)			$ 76,222	$ 51,410	$ 1,753
Statutory capital and surplus	$ 271,977		314,508	271,977	213,721
Shareholder's equity	394,169		384,754	394,169
Dividends received from subsidiary	10,000	$ 15,000	0
BERMUDA
Statutory Accounting Practices
Statutory net income (loss)			200	1,400	$ 900
Statutory capital and surplus	15,700		15,600	15,700
Minimum statutory solvency margin	1,200		1,200	1,200
Shareholder's equity	$ 17,000		$ 15,500	$ 17,000
BERMUDA | Minimum
Statutory Accounting Practices
Liquidity ratio			75.00%

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The minimum amount of excess of value of assets over that of liabilities.

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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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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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