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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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