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Investments - Schedule of Proceeds from Sales or Other Redemptions of Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Proceeds From Sale And Maturity Of Available For Sale Securities [Abstract]      
Proceeds from sales or other redemptions $ 414,138 $ 306,303 $ 354,823