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Investments (Components of Net Realized and Unrealized Gains (Losses)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (Loss) on Securities [Line Items]      
Unrealized Gain (Loss) on Investments recognized in income on equity securities remaining in our portfolio at end of period $ 7,936 $ 1,219 $ (3,098)
Proceeds from Sale of Equity Securities 1,320 137,294 113,339
Unrealized gains (losses) recognized in income on equity securities that were sold in the respective period 3 (9,868) (26,271)
Total unrealized (losses) recognized in income on equity securities 7,939 (8,649) (29,369)
Sale of fixed income securities, available-for-sale 487,087 $ 594,743 $ 2,030,664
Losses on securities for which we have the intent to sell 16,266    
Corporate Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Losses on securities for which we have the intent to sell $ 12,100