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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Foreign currency translation adjustments:      
Change in unrealized foreign currency translation gains (losses) $ (25,059) $ 17,383 $ 6,689
Income tax expense (benefit) on unrealized foreign currency translation gains (losses)   195 81
Change in unrealized foreign currency translation gains (losses), net of income taxes (25,059) 17,188 6,608
Unrealized gain (losses) on available-for-sale securities:      
Change in unrealized holding gains (losses) arising during period before income taxes (59,661) (3,950) 20,500
Income tax expense (benefit) on unrealized holding gains (losses) arising during period (12,681) (1,765) 7,174
Change in unrealized holding gains (losses) on available-for-sale securities arising during period, net of income taxes (46,980) (2,185) 13,326
Reclassification adjustment for realized investment (gains) losses included in net income (45) (1,589) (3,955)
Income tax (expense) benefit on (gains) losses reclassified from accumulated OCI to net income (9) (556) (1,384)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities, net of income taxes (36) (1,033) (2,571)
Change in unrealized gains (losses) on available-for-sale securities, net of income taxes and reclassification adjustment $ (47,016) $ (3,218) $ 10,755