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Investments - Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment [Line Items]      
Total Other-Than-Temporary Impairments $ 6,550 $ 2,614 $ 0
Net realized gains (losses) on investments      
Investment [Line Items]      
Total Other-Than-Temporary Impairments 0 163 0
Other expenses, net      
Investment [Line Items]      
Total Other-Than-Temporary Impairments $ 6,550 $ 2,451 $ 0