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Investments (Other Than Temporary Impairment by Asset Type) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Securities
Dec. 31, 2012
Securities
Dec. 31, 2011
Securities
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                 10 41 67
Total OTTI losses                 $ (4,964) $ (5,411) $ (20,180)
Portion of OTTI losses recognized from other comprehensive income                 (1,270) (9,521) (13,796)
Net OTTI losses recognized in operations 0 (222) (2,775) (3,237) (9,387) (1,686) (978) (2,881) (6,234) (14,932) (33,976)
United States Government Sponsored Agencies [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                 2    
Total OTTI losses                 (2,775)    
Portion of OTTI losses recognized from other comprehensive income                 0    
Net OTTI losses recognized in operations                 (2,775)    
Corporate Securities [Member] | Industrial [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                 1    
Total OTTI losses                 (1,761)    
Portion of OTTI losses recognized from other comprehensive income                 0    
Net OTTI losses recognized in operations                 (1,761)    
Corporate Securities [Member] | Finance [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                   1  
Total OTTI losses                   (1,765)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   (1,765)  
Corporate Securities [Member] | Retail [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                   1  
Total OTTI losses                   (622)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   (622)  
Residential Mortgage Backed Securities [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                 6 39 66
Total OTTI losses                 0 (3,024) (19,420)
Portion of OTTI losses recognized from other comprehensive income                 (1,270) (9,521) (13,796)
Net OTTI losses recognized in operations                 (1,270) (12,545) (33,216)
Equity Securities, Available For Sale [Member] | Industrial [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                 1    
Total OTTI losses                 (428)    
Portion of OTTI losses recognized from other comprehensive income                 0    
Net OTTI losses recognized in operations                 (428)    
Equity Securities, Available For Sale [Member] | Finance [Member]
                      
Gain (Loss) on Investments [Line Items]                      
Other than temporary impairment, number of securities                     1
Total OTTI losses                     (760)
Portion of OTTI losses recognized from other comprehensive income                     0
Net OTTI losses recognized in operations                     $ (760)