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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
Sep. 30, 2019
Dec. 31, 2018
Investment Holdings [Line Items]    
Amortized cost $ 241,531 $ 352,207
OTTI recognized in other comprehensive income (loss) (155,262) (171,546)
Change in fair value since OTTI was recognized 191,389 205,712
Fair value 277,658 386,373
Corporate Securities    
Investment Holdings [Line Items]    
Amortized cost 28,728 69,580
OTTI recognized in other comprehensive income (loss) (3,700) (3,700)
Change in fair value since OTTI was recognized 10,088 6,195
Fair value 35,116 72,075
Residential Mortgage Backed Securities    
Investment Holdings [Line Items]    
Amortized cost 198,959 245,691
OTTI recognized in other comprehensive income (loss) (151,562) (167,846)
Change in fair value since OTTI was recognized 180,704 199,191
Fair value 228,101 277,036
Commercial Mortgage Backed Securities    
Investment Holdings [Line Items]    
Amortized cost 12,867 35,244
OTTI recognized in other comprehensive income (loss) 0 0
Change in fair value since OTTI was recognized 271 0
Fair value 13,138 35,244
Other Asset Backed Securities    
Investment Holdings [Line Items]    
Amortized cost 977 1,692
OTTI recognized in other comprehensive income (loss) 0 0
Change in fair value since OTTI was recognized 326 326
Fair value $ 1,303 $ 2,018