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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Due in one year or less fair value $ 306,493  
Due after one year through five years fair value 2,095,055  
Due after five years through 10 years fair value 2,379,624  
Due after ten years fair value 237,550  
AFS, Fair Value 5,018,722 $ 4,792,540
Due in one year or less carrying value 34,521  
Due after one year through five years carrying value 29,648  
Due after five years through 10 years carrying value 8,345  
Due after 10 years carrying value 0  
Carrying Value 72,514 101,556
Due in one year or less fair value 34,898  
Due after one year through five years fair value 31,498  
Due after five years through 10 years fair value 9,144  
Due after 10 years fair value 0  
HTM, Fair Value $ 75,540 $ 105,211