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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
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Sep. 30, 2019  
Available-for-sale securities, estimated fair value, less than 12 months $ 452,146 $ 2,610,752
Available-for-sale securities, gross unrealized holding losses, less than 12 months (12,754) (56,485)
Available-for-sale securities, estimated fair value, 12 months or longer 495,569 1,983,912
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (11,065) (77,504)
Available-for-sale securities, estimated fair value 947,715 4,594,664
Available-for-sale securities, gross unrealized holding losses (23,819) (133,989)
Short-term Investments, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 115,139 197,643
Short-term Investments, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,100) (2,774)
Short-term Investments, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Short-term Investments, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Short-term Investments, Available-for-sale, Unrealized Loss Position, Total 115,139 197,643
Short-term Investments, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,100) (2,774)
U.S. Treasury securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 7,481 2,922
Available-for-sale securities, gross unrealized holding losses, less than 12 months (6) (83)
Available-for-sale securities, estimated fair value, 12 months or longer 81,674 156,352
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (193) (1,869)
Available-for-sale securities, estimated fair value 89,155 159,274
Available-for-sale securities, gross unrealized holding losses (199) (1,952)
U.S. government-sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 0 88,854
Available-for-sale securities, gross unrealized holding losses, less than 12 months 0 (1,923)
Available-for-sale securities, estimated fair value, 12 months or longer 35,386 96,337
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (11) (2,191)
Available-for-sale securities, estimated fair value 35,386 185,191
Available-for-sale securities, gross unrealized holding losses (11) (4,114)
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 1,053 656,573
Available-for-sale securities, gross unrealized holding losses, less than 12 months (13) (12,455)
Available-for-sale securities, estimated fair value, 12 months or longer 25,289 453,736
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (99) (16,413)
Available-for-sale securities, estimated fair value 26,342 1,110,309
Available-for-sale securities, gross unrealized holding losses (112) (28,868)
Foreign governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 157,525 419,764
Available-for-sale securities, gross unrealized holding losses, less than 12 months (5,764) (14,461)
Available-for-sale securities, estimated fair value, 12 months or longer 166,998 84,776
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (8,488) (7,117)
Available-for-sale securities, estimated fair value 324,523 504,540
Available-for-sale securities, gross unrealized holding losses (14,252) (21,578)
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 0 653,410
Available-for-sale securities, gross unrealized holding losses, less than 12 months 0 (10,128)
Available-for-sale securities, estimated fair value, 12 months or longer 34,144 709,971
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (230) (34,399)
Available-for-sale securities, estimated fair value 34,144 1,363,381
Available-for-sale securities, gross unrealized holding losses (230) (44,527)
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 2,105 276,777
Available-for-sale securities, gross unrealized holding losses, less than 12 months (9) (3,685)
Available-for-sale securities, estimated fair value, 12 months or longer 71,317 242,949
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (654) (8,814)
Available-for-sale securities, estimated fair value 73,422 519,726
Available-for-sale securities, gross unrealized holding losses (663) (12,499)
Asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 0 1,645
Available-for-sale securities, gross unrealized holding losses, less than 12 months 0 (11)
Available-for-sale securities, estimated fair value, 12 months or longer 2,242 17,030
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (3) (202)
Available-for-sale securities, estimated fair value 2,242 18,675
Available-for-sale securities, gross unrealized holding losses (3) (213)
Corporate bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 168,843 313,164
Available-for-sale securities, gross unrealized holding losses, less than 12 months (5,862) (10,965)
Available-for-sale securities, estimated fair value, 12 months or longer 78,519 222,761
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (1,387) (6,499)
Available-for-sale securities, estimated fair value 247,362 535,925
Available-for-sale securities, gross unrealized holding losses (7,249) (17,464)
Total fixed maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, estimated fair value, less than 12 months 337,007 2,413,109
Available-for-sale securities, gross unrealized holding losses, less than 12 months (11,654) (53,711)
Available-for-sale securities, estimated fair value, 12 months or longer 495,569 1,983,912
Available-for-sale securities, gross unrealized holding losses, 12 months or longer (11,065) (77,504)
Available-for-sale securities, estimated fair value 832,576 4,397,021
Available-for-sale securities, gross unrealized holding losses $ (22,719) $ (131,215)