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Derivative Instruments (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Change in fair value of derivatives:    
Net realized investment gains (losses) [1] $ 2,437 $ (218)
Change in fair value of embedded derivatives:    
Net realized investment losses $ (2,366) $ (676)
[1] Includes the gains or losses recognized at the expiration of the option term or early termination and the changes in fair value for open options.