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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