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Investments (Components Of Net Investment Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Document Period End Date     Sep. 30, 2019  
Municipal bonds (tax-exempt) $ 17,456 $ 19,588 $ 54,167 $ 60,810
Short-term investments, including overnight deposits 14,294 13,719 38,259 36,224
Dividends on equity securities 25,493 21,721 73,486 66,202
Income from equity method investments 366 (3,556) 3,436 (3,268)
Other 797 255 3,971 242
Total investment income 117,408 111,293 351,536 332,646
Investment expenses (4,026) (4,986) (12,141) (12,936)
Net investment income 113,382 106,307 339,395 319,710
Taxable Municipal Bonds [Member]        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Taxable bonds 18,442 18,634 55,634 54,487
Other Taxable Bonds [Member]        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Taxable bonds $ 40,560 $ 40,932 $ 122,583 $ 117,949