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Investments (Available-For-Sale Investments) (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 fixed maturity investments, amortized cost $ 9,601,898 $ 9,950,773
Available-for-sale fixed maturity investments, gross unrealized holding gains 624,846 223,630
Available-for-sale fixed maturity investments, gross unrealized holding losses (22,719) (131,215)
Available-for-sale fixed maturity investments, estimated fair value 10,204,025 10,043,188
Short-term Investments, Available-for-Sale, Amortized Cost Basis 1,546,129 1,080,027
Short-term Investments, Available-for-Sale, Accumulated Gross Unrealized Gain Before Tax 364 443
Short-term Investments, Available-for-Sale, Accumulated Gross Unrealized Loss Before Tax (1,100) (2,774)
Short-term Investments, Available-for-Sale 1,545,393 1,077,696
Investments, Available-for-Sale, Amortized Cost Basis 11,148,027 11,030,800
Investments, Available-for-Sale, Accumulated Gross Unrealized Gain Before Tax 625,210 224,073
Investments, Available-for-Sale, Accumulated Gross Unrealized Loss Before Tax 23,819 133,989
Investments, Available-for-Sale 11,749,418 11,120,884
U.S. Treasury securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 293,954 248,286
Available-for-sale fixed maturity investments, gross unrealized holding gains 3,201 308
Available-for-sale fixed maturity investments, gross unrealized holding losses (199) (1,952)
Available-for-sale fixed maturity investments, estimated fair value 296,956 246,642
U.S. government-sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 331,356 357,765
Available-for-sale fixed maturity investments, gross unrealized holding gains 28,628 5,671
Available-for-sale fixed maturity investments, gross unrealized holding losses (11) (4,114)
Available-for-sale fixed maturity investments, estimated fair value 359,973 359,322
Obligations of states, municipalities and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 4,047,517 4,285,068
Available-for-sale fixed maturity investments, gross unrealized holding gains 272,703 96,730
Available-for-sale fixed maturity investments, gross unrealized holding losses (112) (28,868)
Available-for-sale fixed maturity investments, estimated fair value 4,320,108 4,352,930
Foreign governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 1,471,214 1,482,826
Available-for-sale fixed maturity investments, gross unrealized holding gains 158,652 98,356
Available-for-sale fixed maturity investments, gross unrealized holding losses (14,252) (21,578)
Available-for-sale fixed maturity investments, estimated fair value 1,615,614 1,559,604
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 1,708,617 1,691,572
Available-for-sale fixed maturity investments, gross unrealized holding gains 81,696 3,154
Available-for-sale fixed maturity investments, gross unrealized holding losses (230) (44,527)
Available-for-sale fixed maturity investments, estimated fair value 1,790,083 1,650,199
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 868,317 886,501
Available-for-sale fixed maturity investments, gross unrealized holding gains 42,015 6,170
Available-for-sale fixed maturity investments, gross unrealized holding losses (663) (12,499)
Available-for-sale fixed maturity investments, estimated fair value 909,669 880,172
Asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 9,881 19,614
Available-for-sale fixed maturity investments, gross unrealized holding gains 46 7
Available-for-sale fixed maturity investments, gross unrealized holding losses (3) (213)
Available-for-sale fixed maturity investments, estimated fair value 9,924 19,408
Corporate bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 871,042 979,141
Available-for-sale fixed maturity investments, gross unrealized holding gains 37,905 13,234
Available-for-sale fixed maturity investments, gross unrealized holding losses (7,249) (17,464)
Available-for-sale fixed maturity investments, estimated fair value $ 901,698 $ 974,911