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Unpaid Losses And Loss Adjustment Expenses (Ultimate Incurred Losses And Cumulative Paid Losses And Allocated Loss Adjustment Expenses, Net Of Reinsurance) (Details)
number in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]              
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 9,006,199            
Reinsurance [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 4,264,423            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,880,409            
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance 650,117            
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 3,034,131            
Reinsurance [Member] | 2012 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 446,722 $ 454,839 $ 457,038 $ 485,374 $ 507,023 $ 550,343 $ 72,903
Total of incurred-but-not-reported liabilities, net of reinsurance 62,700            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 288,772 263,811 231,541 183,943 128,769 64,460 4,049
Reinsurance [Member] | 2013 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 506,609 543,963 534,148 547,828 578,994 586,074  
Total of incurred-but-not-reported liabilities, net of reinsurance 78,266            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 331,630 301,714 268,761 209,893 155,515 71,503  
Reinsurance [Member] | 2014 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 556,775 578,688 536,247 564,720 577,123    
Total of incurred-but-not-reported liabilities, net of reinsurance 121,489            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 312,296 275,278 226,883 158,105 97,918    
Reinsurance [Member] | 2015 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 522,783 531,854 514,050 528,076      
Total of incurred-but-not-reported liabilities, net of reinsurance 197,446            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 259,366 207,985 133,932 63,924      
Reinsurance [Member] | 2016 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 531,769 533,526 523,958        
Total of incurred-but-not-reported liabilities, net of reinsurance 199,881            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 241,072 169,877 79,383        
Reinsurance [Member] | 2017 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 939,604 906,216          
Total of incurred-but-not-reported liabilities, net of reinsurance 403,107            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 359,659 158,049          
Reinsurance [Member] | 2018 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 760,161            
Total of incurred-but-not-reported liabilities, net of reinsurance 543,670            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 87,614            
Insurance [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 12,088,244            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 6,928,416            
All outstanding liabilities for unpaid losses and loss adjustment expenses before 2012, net of reinsurance 605,610            
Total liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 5,765,438            
Insurance [Member] | 2012 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 1,348,062 1,361,513 1,395,103 1,427,255 1,489,026 1,609,802 1,369,219
Total of incurred-but-not-reported liabilities, net of reinsurance $ 119,585            
Cumulative number of reported claims 127            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,150,793 1,117,221 1,052,859 937,643 780,067 567,450 $ 233,371
Insurance [Member] | 2013 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 1,387,804 1,428,733 1,462,652 1,525,750 1,694,879 1,735,667  
Total of incurred-but-not-reported liabilities, net of reinsurance $ 200,744            
Cumulative number of reported claims 87            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,099,985 1,037,635 949,370 779,023 571,548 $ 271,439  
Insurance [Member] | 2014 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 1,522,132 1,570,428 1,627,960 1,695,698 1,862,947    
Total of incurred-but-not-reported liabilities, net of reinsurance $ 213,237            
Cumulative number of reported claims 78            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,167,598 1,062,211 894,470 657,742 $ 331,626    
Insurance [Member] | 2015 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 1,530,354 1,585,447 1,710,271 1,783,064      
Total of incurred-but-not-reported liabilities, net of reinsurance $ 291,364            
Cumulative number of reported claims 84            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 1,040,377 876,509 665,112 $ 322,633      
Insurance [Member] | 2016 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 1,686,374 1,786,959 1,871,455        
Total of incurred-but-not-reported liabilities, net of reinsurance $ 378,681            
Cumulative number of reported claims 89            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 981,920 752,606 $ 372,182        
Insurance [Member] | 2017 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 2,160,771 2,326,966          
Total of incurred-but-not-reported liabilities, net of reinsurance $ 691,736            
Cumulative number of reported claims 116            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 990,931 $ 438,289          
Insurance [Member] | 2018 Accident Year [Member]              
Claims Development [Line Items]              
Ultimate incurred losses and allocated loss adjustment expenses, net of reinsurance 2,452,747            
Total of incurred-but-not-reported liabilities, net of reinsurance $ 1,466,264            
Cumulative number of reported claims 147            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 496,812            
Personal Lines [Member] | Insurance [Member] | 2012 Accident Year [Member]              
Claims Development [Line Items]              
Cumulative number of reported claims 66            
Personal Lines [Member] | Insurance [Member] | 2013 Accident Year [Member]              
Claims Development [Line Items]              
Cumulative number of reported claims 17            
Personal Lines [Member] | Insurance [Member] | 2017 Accident Year [Member]              
Claims Development [Line Items]              
Cumulative number of reported claims 24            
Personal Lines [Member] | Insurance [Member] | 2018 Accident Year [Member]              
Claims Development [Line Items]              
Cumulative number of reported claims 46