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Investments (Cumulative Noncredit Portion of Other Than Temporary Impairment Recognized in Other Comprehensive Income and Change in Fair Value Since Other Than Temporary Impairment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Investment Holdings [Line Items]    
Amortized cost $ 446,879 $ 481,421
OTTI recognized in other comprehensive income (175,464) (178,824)
Change in fair value since OTTI was recognized 206,642 198,605
Fair value 478,057 501,202
Fixed Maturity Securities [Member] | Corporate Securities [Member]    
Investment Holdings [Line Items]    
Amortized cost 8,764 6,396
OTTI recognized in other comprehensive income (3,537) (2,975)
Change in fair value since OTTI was recognized 7,234 9
Fair value 12,461 3,430
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Amortized cost 416,615 466,871
OTTI recognized in other comprehensive income (170,284) (170,724)
Change in fair value since OTTI was recognized 200,735 199,149
Fair value 447,066 495,296
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Investment Holdings [Line Items]    
Amortized cost 16,646  
OTTI recognized in other comprehensive income 0  
Change in fair value since OTTI was recognized 206  
Fair value 16,852  
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]    
Investment Holdings [Line Items]    
Amortized cost 4,854 8,154
OTTI recognized in other comprehensive income (1,643) (5,125)
Change in fair value since OTTI was recognized (1,533) (553)
Fair value $ 1,678 $ 2,476