Other comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Before-Tax Amount
Other comprehensive (loss) income	$ (65,035)	$ (20,665)	$ 24,678
Tax Expense (Benefit)
Other comprehensive (loss) income	(13,439)	(3,896)	4,957
Net-of-Tax Amount
Other comprehensive (loss) income	(51,596)	(16,769)	19,721
Foreign currency translation adjustments
Before-Tax Amount
Other comprehensive (loss) income	(18,634)	(298)	5,777
Tax Expense (Benefit)
Other comprehensive (loss) income	(3,695)	381	988
Net-of-Tax Amount
Other comprehensive (loss) income	(14,939)	(679)	4,789
Net unrealized gains and losses on investments
Before-Tax Amount
Change in net unrealized gains and losses on investments	(44,830)	(17,279)	19,548
Reclassification adjustment for realized gains and losses on investments	(1,571)	(3,088)	(647)
Other comprehensive (loss) income	(46,401)	(20,367)	18,901
Tax Expense (Benefit)
Change in net unrealized gains and losses on investments	(9,414)	(3,629)	4,105
Reclassification adjustment for realized gains and losses on investments	(330)	(648)	(136)
Other comprehensive (loss) income	(9,744)	(4,277)	3,969
Net-of-Tax Amount
Change in net unrealized gains and losses on investments	(35,416)	(13,650)	15,443
Reclassification adjustment for realized gains and losses on investments	(1,241)	(2,440)	(511)
Other comprehensive (loss) income	$ (36,657)	$ (16,090)	$ 14,932