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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Foreign currency translation adjustments:    
Change in unrealized foreign currency translation gains (losses) $ 4,992 $ (29,011)
Change in unrealized foreign currency translation gains (losses), net of income taxes 4,992 (29,011)
Unrealized gain (losses) on available-for-sale securities:    
Change in unrealized holding gains (losses) arising during period before income taxes (64,890) (86,887)
Income tax expense (benefit) on unrealized holding gains (losses) arising during period (14,185) (18,312)
Change in unrealized holding gains (losses) on available-for-sale securities arising during period, net of income taxes (50,705) (68,575)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities (468) 3,410
Income tax (expense) benefit on (gains) losses reclassified from accumulated OCI to net income (98) 716
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities, net of income taxes (370) 2,694
Change in unrealized gains (losses) on available-for-sale securities, net of income taxes and reclassification adjustment $ (51,075) $ (65,881)