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Investments (Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months $ 885,412 $ 611,152
Available-for-sale securities, gross unrealized holding losses, less than 12 months (9,815) (7,192)
Available-for-sale securities, estimated fair value, 12 months or longer 187,916 352,025
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (6,981) (7,287)
Available-for-sale securities, estimated fair value 1,073,328 963,177
Available-for-sale securities, gross unrealized holding losses (16,796) (14,479)
Short-term investments, estimated fair value, less than 12 months 566,873 3,316
Short-term investments, gross unrealized holding losses, less than 12 months (2,772) (60)
Short-term investments, estimated fair value, 12 months or longer 0 0
Short-term investments, gross unrealized holding losses, 12 months or longer 0 0
Short-term investments, estimated fair value 566,873 3,316
Short-term investments, gross unrealized holding losses (2,772) (60)
U.S. Treasury securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 7,675 36,862
Available-for-sale securities, gross unrealized holding losses, less than 12 months (19) (361)
Available-for-sale securities, estimated fair value, 12 months or longer 0 46,518
Available-for-sale securities, gross unrealized holding losses, 12 months or longer 0 (41)
Available-for-sale securities, estimated fair value 7,675 83,380
Available-for-sale securities, gross unrealized holding losses (19) (402)
U.S. government-sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months   24,148
Available-for-sale securities, gross unrealized holding losses, less than 12 months   (197)
Available-for-sale securities, estimated fair value, 12 months or longer   2,868
Available-for-sale securities, gross unrealized holding losses, 12 months or longer   (3)
Available-for-sale securities, estimated fair value   27,016
Available-for-sale securities, gross unrealized holding losses   (200)
Obligations of states, municipalities and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 46,271 127,836
Available-for-sale securities, gross unrealized holding losses, less than 12 months (1,009) (702)
Available-for-sale securities, estimated fair value, 12 months or longer 3,025 6,830
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (23) (110)
Available-for-sale securities, estimated fair value 49,296 134,666
Available-for-sale securities, gross unrealized holding losses (1,032) (812)
Foreign governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 173,200 162,907
Available-for-sale securities, gross unrealized holding losses, less than 12 months (4,295) (3,393)
Available-for-sale securities, estimated fair value, 12 months or longer 160,104 159,888
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (5,648) (6,005)
Available-for-sale securities, estimated fair value 333,304 322,795
Available-for-sale securities, gross unrealized holding losses (9,943) (9,398)
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 2,033 202,530
Available-for-sale securities, gross unrealized holding losses, less than 12 months (14) (1,126)
Available-for-sale securities, estimated fair value, 12 months or longer 7,425 33,853
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (21) (256)
Available-for-sale securities, estimated fair value 9,458 236,383
Available-for-sale securities, gross unrealized holding losses (35) (1,382)
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 3,756 11,706
Available-for-sale securities, gross unrealized holding losses, less than 12 months (35) (66)
Available-for-sale securities, estimated fair value, 12 months or longer 0 58,162
Available-for-sale securities, gross unrealized holding losses, 12 months or longer 0 (451)
Available-for-sale securities, estimated fair value 3,756 69,868
Available-for-sale securities, gross unrealized holding losses (35) (517)
Asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 359 0
Available-for-sale securities, gross unrealized holding losses, less than 12 months 0 0
Available-for-sale securities, estimated fair value, 12 months or longer 0 3,632
Available-for-sale securities, gross unrealized holding losses, 12 months or longer 0 (22)
Available-for-sale securities, estimated fair value 359 3,632
Available-for-sale securities, gross unrealized holding losses 0 (22)
Corporate bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 85,245 41,847
Available-for-sale securities, gross unrealized holding losses, less than 12 months (1,671) (1,287)
Available-for-sale securities, estimated fair value, 12 months or longer 17,362 40,274
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (1,289) (399)
Available-for-sale securities, estimated fair value 102,607 82,121
Available-for-sale securities, gross unrealized holding losses (2,960) (1,686)
Total fixed maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 318,539 607,836
Available-for-sale securities, gross unrealized holding losses, less than 12 months (7,043) (7,132)
Available-for-sale securities, estimated fair value, 12 months or longer 187,916 352,025
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (6,981) (7,287)
Available-for-sale securities, estimated fair value 506,455 959,861
Available-for-sale securities, gross unrealized holding losses $ (14,024) $ (14,419)