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Investments (Other Than Temporary Impairments by Asset Type) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Securities
Sep. 30, 2014
USD ($)
Securities
Sep. 30, 2015
USD ($)
Securities
Sep. 30, 2014
USD ($)
Securities
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities 4   8  
Total OTTI losses $ (10,000) $ 0 $ (10,132) $ 0
Portion of OTTI losses recognized in (from) other comprehensive income 4,771 (564) 3,943 (2,063)
Net OTTI losses recognized in operations $ (5,229) $ (564) $ (6,189) $ (2,063)
Residential Mortgage Backed Securities [Member]        
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities 3 3 7 6
Total OTTI losses $ 0 $ 0 $ (132) $ 0
Portion of OTTI losses recognized in (from) other comprehensive income (354) (564) (1,182) (2,063)
Net OTTI losses recognized in operations $ (354) $ (564) $ (1,314) $ (2,063)
Other Asset Backed Securities [Member]        
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities 1   1  
Total OTTI losses $ (10,000)   $ (10,000)  
Portion of OTTI losses recognized in (from) other comprehensive income 5,125   5,125  
Net OTTI losses recognized in operations $ (4,875)   $ (4,875)