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Investments - Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investment [Line Items]
Total other-than-temporary impairments	$ 623	$ 0	$ 623	$ 6,112
Net realized and unrealized gains (losses) on investments
Investment [Line Items]
Total other-than-temporary impairments	623	0	623	0
Other income (expenses), net
Investment [Line Items]
Total other-than-temporary impairments	$ 0	$ 0	$ 0	$ 6,112

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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