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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
Mar. 31, 2019
Dec. 31, 2018
Investment Holdings [Line Items]    
Amortized cost $ 339,937 $ 352,207
OTTI recognized in other comprehensive income (loss) (171,546) (171,546)
Change in fair value since OTTI was recognized 211,750 205,712
Fair value 380,141 386,373
Corporate Securities    
Investment Holdings [Line Items]    
Amortized cost 69,725 69,580
OTTI recognized in other comprehensive income (loss) (3,700) (3,700)
Change in fair value since OTTI was recognized 11,082 6,195
Fair value 77,107 72,075
Residential Mortgage Backed Securities    
Investment Holdings [Line Items]    
Amortized cost 236,606 245,691
OTTI recognized in other comprehensive income (loss) (167,846) (167,846)
Change in fair value since OTTI was recognized 199,952 199,191
Fair value 268,712 277,036
Commercial Mortgage Backed Securities    
Investment Holdings [Line Items]    
Amortized cost 31,964 35,244
OTTI recognized in other comprehensive income (loss) 0 0
Change in fair value since OTTI was recognized 800 0
Fair value 32,764 35,244
Other Asset Backed Securities    
Investment Holdings [Line Items]    
Amortized cost 1,642 1,692
OTTI recognized in other comprehensive income (loss) 0 0
Change in fair value since OTTI was recognized (84) 326
Fair value $ 1,558 $ 2,018