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Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Due in one year or less carrying value $ 84,415  
Due after one year through five years carrying value 65,616  
Due after five years through 10 years carrying value 10,266  
Carrying Value 160,297 $ 201,354
Due in one year or less fair value 85,514  
Due after one year through five years fair value 69,914  
Due after five years through 10 years fair value 11,633  
HTM, Fair Value $ 167,061 $ 209,544