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Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
Due in one year or less carrying value $ 99,364  
Due after one year through five years carrying value 220,937  
Due after five years through 10 years carrying value 15,781  
Carrying Value 336,082 392,879
Due in one year or less fair value 100,786  
Due after one year through five years fair value 235,038  
Due after five years through 10 years fair value 18,366  
HTM, Fair Value $ 354,190 $ 416,981