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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

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