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Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Foreign currency translation adjustments:
Change in unrealized foreign currency translation gains (losses)	$ (9,121)	$ 7,390	$ (5,963)	$ 12,382
Change in unrealized foreign currency translation gains (losses), net of income taxes	(9,121)	7,390	(5,963)	12,382
Unrealized gain (losses) on available-for-sale securities:
Change in unrealized holding gains (losses) arising during period before income taxes	(138,879)	26,018	(303,818)	(38,874)
Income tax expense (benefit) on unrealized holding gains (losses) arising during period	(29,616)	5,524	(64,858)	(8,663)
Change in unrealized holding gains (losses) on available-for-sale securities arising during period, net of income taxes	(109,263)	20,494	(238,960)	(30,211)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities	(56)	(705)	(713)	(1,173)
Income tax (expense) benefit on (gains) losses reclassified from accumulated OCI to net income	(12)	(148)	(150)	(246)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities, net of income taxes	(44)	(557)	(563)	(927)
Change in unrealized gains (losses) on available-for-sale securities, net of income taxes and reclassification adjustment	$ (109,307)	$ 19,937	$ (239,523)	$ (31,138)

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