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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Foreign currency translation adjustments:        
Change in unrealized foreign currency translation gains (losses) $ 13,644 $ 6,639 $ (15,367) $ 12,806
Change in unrealized foreign currency translation gains (losses), net of income taxes 13,644 6,639 (15,367) 12,806
Unrealized gain (losses) on available-for-sale securities:        
Change in unrealized holding gains (losses) arising during period before income taxes 121,164 34,826 34,275 81,027
Income tax expense (benefit) on unrealized holding gains (losses) arising during period 25,937 7,444 7,623 17,409
Change in unrealized holding gains (losses) on available-for-sale securities arising during period, net of income taxes 95,227 27,382 26,652 63,618
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities (231) (90) 3,179 (25)
Income tax (expense) benefit on (gains) losses reclassified from accumulated OCI to net income (48) (19) 668 (5)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities, net of income taxes (183) (71) 2,511 (20)
Change in unrealized gains (losses) on available-for-sale securities, net of income taxes and reclassification adjustment $ 95,044 $ 27,311 $ 29,163 $ 63,598