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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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