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Investments (Net Realized and Unrealized Investment Gains and (Losses)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Gain (Loss) on Securities [Line Items]        
Gross gains on sales $ 367 $ 7,094 $ 5,307 $ 23,843
Gross losses on sales (5,264) (19,668) (30,146) (52,573)
Net realized gains (losses) on disposals (4,897) (12,574) (24,839) (28,730)
Net unrealized gains (losses) on equity securities 489 (7,777) 8,662 (31,791)
Losses on securities for which we have the intent to sell 0 (913) (645) (6,412)
Net realized and unrealized investment gains (losses) (6,880) (25,681) (8,962) (108,913)
Available-for-sale Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) (2,468) (4,471) 7,925 (42,042)
Held-to-maturity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) 0 54 0 62
Commercial Mortgage Loans [Member]        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) $ (4) $ 0 $ (65) $ 0