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Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investments [Abstract]    
Due in one year or less carrying value $ 80,337  
Due after one year through five years carrying value 270,608  
Due after five years through 10 years carrying value 31,111  
Total HTM fixed income securities carrying value 382,056 392,879
Due in one year or less fair value 81,332  
Due after one year through five years fair value 287,045  
Due after five years through 10 years fair value 35,159  
Total HTM fixed income securities fair value $ 403,536 $ 416,981