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Investments (Available-For-Sale Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost $ 9,950,773 $ 9,551,153
Available-for-sale investments, amortized cost 11,030,800 14,379,831
Available-for-sale investments, gross unrealized holding gains 224,073 3,747,008
Available-for-sale investments, gross unrealized holding losses (133,989) (57,348)
Available-for-sale fixed maturity investments, estimated fair value 10,043,188 9,940,670
Available-for-sale investments, estimated fair value 11,120,884 18,069,491
U.S. Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 248,286 162,378
Available-for-sale fixed maturity investments, gross unrealized holding gains 308 54
Available-for-sale fixed maturity investments, gross unrealized holding losses (1,952) (1,819)
Available-for-sale fixed maturity investments, estimated fair value 246,642 160,613
U.S. Government-Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 357,765 352,455
Available-for-sale fixed maturity investments, gross unrealized holding gains 5,671 11,883
Available-for-sale fixed maturity investments, gross unrealized holding losses (4,114) (818)
Available-for-sale fixed maturity investments, estimated fair value 359,322 363,520
Obligations Of States, Municipalities And Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 4,285,068 4,381,358
Available-for-sale fixed maturity investments, gross unrealized holding gains 96,730 193,120
Available-for-sale fixed maturity investments, gross unrealized holding losses (28,868) (7,916)
Available-for-sale fixed maturity investments, estimated fair value 4,352,930 4,566,562
Foreign Governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 1,482,826 1,341,628
Available-for-sale fixed maturity investments, gross unrealized holding gains 98,356 150,010
Available-for-sale fixed maturity investments, gross unrealized holding losses (21,578) (2,410)
Available-for-sale fixed maturity investments, estimated fair value 1,559,604 1,489,228
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 1,691,572 1,244,777
Available-for-sale fixed maturity investments, gross unrealized holding gains 3,154 6,108
Available-for-sale fixed maturity investments, gross unrealized holding losses (44,527) (16,559)
Available-for-sale fixed maturity investments, estimated fair value 1,650,199 1,234,326
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 886,501 846,916
Available-for-sale fixed maturity investments, gross unrealized holding gains 6,170 14,115
Available-for-sale fixed maturity investments, gross unrealized holding losses (12,499) (4,863)
Available-for-sale fixed maturity investments, estimated fair value 880,172 856,168
Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 19,614 34,942
Available-for-sale fixed maturity investments, gross unrealized holding gains 7 8
Available-for-sale fixed maturity investments, gross unrealized holding losses (213) (222)
Available-for-sale fixed maturity investments, estimated fair value 19,408 34,728
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 979,141 1,186,699
Available-for-sale fixed maturity investments, gross unrealized holding gains 13,234 51,563
Available-for-sale fixed maturity investments, gross unrealized holding losses (17,464) (2,737)
Available-for-sale fixed maturity investments, estimated fair value 974,911 1,235,525
Total Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale fixed maturity investments, amortized cost 9,950,773 9,551,153
Available-for-sale fixed maturity investments, gross unrealized holding gains 223,630 426,861
Available-for-sale fixed maturity investments, gross unrealized holding losses (131,215) (37,344)
Available-for-sale fixed maturity investments, estimated fair value 10,043,188 9,940,670
Insurance, Banks And Other Financial Institutions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments, amortized cost [1]   899,324
Available-for-sale investments, gross unrealized holding gains [1]   1,209,162
Available-for-sale investments, gross unrealized holding losses [1]   (5,453)
Available-for-sale investments, estimated fair value [1]   2,103,033
Industrial, Consumer And All Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments, amortized cost [1]   1,768,337
Available-for-sale investments, gross unrealized holding gains [1]   2,110,959
Available-for-sale investments, gross unrealized holding losses [1]   (14,482)
Available-for-sale investments, estimated fair value [1]   3,864,814
Total Equity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments, amortized cost [1]   2,667,661
Available-for-sale investments, gross unrealized holding gains [1]   3,320,121
Available-for-sale investments, gross unrealized holding losses [1]   (19,935)
Available-for-sale investments, estimated fair value [1]   5,967,847
Short-Term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments, amortized cost 1,080,027 2,161,017
Available-for-sale investments, gross unrealized holding gains 443 26
Available-for-sale investments, gross unrealized holding losses (2,774) (69)
Available-for-sale investments, estimated fair value $ 1,077,696 $ 2,160,974
[1] Effective January 1, 2018, the Company adopted ASU No. 2016-01 and equity securities are no longer classified as available-for-sale. Prior periods have not been restated to conform to the current presentation. See note 1.