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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Foreign currency translation adjustments: |  |  |  |
Change in unrealized foreign currency translation gains (losses) before income tax expense (benefit) | $ (5,902) | $ 6,753 | $ (14,304) | $ 7,880
Income tax expense (benefit) on unrealized foreign currency translation gains (losses) |  | 74 |  | 88
Change in unrealized foreign currency translation gains (losses), net of income taxes | (5,902) | 6,679 | (14,304) | 7,792
Unrealized gain (losses) on available-for-sale securities: |  |  |  |
Change in unrealized holding gains (losses) on investment securities | (15,578) | 3,889 | (47,920) | 11,170
Change in net unrealized investment gains (losses) not-other-than-temporarily impaired, income tax expense (benefit) | (3,306) | 1,361 | (10,154) | 3,910
Change in unrealized holding gains (losses) on available-for-sale securities arising during period, net of income taxes | (12,272) | 2,528 | (37,766) | 7,260
Reclassification adjustment for realized investment (gains) losses included in net income | (347) | (273) | (662) | (341)
Income tax (expense) benefits on (gains) losses reclassified from accumulated OCI to net income | (73) | (96) | (139) | (119)
Reclassification from accumulated OCI to net income for (gains) losses realized on available-for-sale securities, net of income taxes | (274) | (177) | (523) | (222)
Change in unrealized gains (losses) on available-for-sale securities, net of income taxes and reclassification adjustment | $ (12,546) | $ 2,351 | $ (38,289) | $ 7,038

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