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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income | $ 86,700 | $ 63,107 | $ 152,414 | $ 115,176
Unrealized investment gains (losses) on available-for-sale securities: |  |  |  |
Change in unrealized holding gains (losses) on investment securities | (15,578) | 3,889 | (47,920) | 11,170
Reclassification adjustment for realized investment (gains) losses included in net income | (347) | (273) | (662) | (341)
Foreign currency translation adjustments: |  |  |  |
Change in unrealized foreign currency translation gains (losses) | (5,902) | 6,753 | (14,304) | 7,880
Total other comprehensive income (loss) before income taxes | (21,827) | 10,369 | (62,886) | 18,709
Income tax expense (benefit) related to items of other comprehensive income (loss) | (3,379) | 1,339 | (10,293) | 3,879
Other comprehensive income (loss), net of income taxes | (18,448) | 9,030 | (52,593) | 14,830
Total comprehensive income | $ 68,252 | $ 72,137 | $ 99,821 | $ 130,006

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