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Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Due in one year or less carrying value $ 83,751  
Due after one year through five years carrying value 66,301  
Due after five years through 10 years carrying value 13,521  
Carrying Value 163,573 $ 201,354
Due in one year or less fair value 85,409  
Due after one year through five years fair value 70,301  
Due after five years through 10 years fair value 15,549  
HTM, Fair Value $ 171,259 $ 209,544