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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investments [Abstract]    
Due in one year or less Carrying Value $ 100,082  
Due after one year through five years Carrying Value 363,382  
Due after five years through 10 years Carrying Value 41,427  
Due after 10 years Carrying Value 2,880  
Total HTM fixed maturity securities Carrying Value 507,771 554,069
Due in one year or less Fair Value 103,261  
Due after one year through five years Fair Value 389,774  
Due after five years through 10 years Fair Value 46,831  
Due after 10 years Fair Value 3,687  
Total HTM fixed maturity securities Fair Value $ 543,553