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Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
Due in one year or less carrying value $ 113,394  
Due after one year through five years carrying value 230,116  
Due after five years through 10 years carrying value 21,428  
Carrying Value 364,938 392,879
Due in one year or less fair value 115,199  
Due after one year through five years fair value 245,500  
Due after five years through 10 years fair value 24,803  
Fixed income securities, held-to-maturity, fair value $ 385,502 $ 416,981