Accumulated Other Comprehensive Income (Loss) - Changes In Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 695,295	$ 697,648
Net unrealized gains (losses) on investments in securities
Ending balance	687,310	683,137
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(28,013)	(34,355)
Net unrealized gains (losses) on investments in securities
Ending balance	(28,845)	(33,494)
Foreign currency translation adjustments
Foreign currency translation adjustments
Other comprehensive income (loss) before reclassifications	(925)	527
Amounts reclassified from accumulated other comprehensive loss	0	0
Net unrealized gains (losses) on investments in securities
Other comprehensive income (loss) before reclassifications	(925)	527
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	(925)	527
Net unrealized gains (losses) on investments in securities
Foreign currency translation adjustments
Other comprehensive income (loss) before reclassifications	93	334
Amounts reclassified from accumulated other comprehensive loss	0	0
Net unrealized gains (losses) on investments in securities
Other comprehensive income (loss) before reclassifications	93	334
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	$ 93	$ 334