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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Premiums earned $ 2,558,372 $ 2,042,405 $ 4,946,237 $ 4,079,219
Incurred losses and LAE 1,586,141 1,407,016 3,297,560 2,837,856
Commission and brokerage 557,749 466,316 1,046,760 914,838
Other underwriting expenses 140,844 118,130 283,075 246,990
Underwriting gain (loss) 273,639 50,943 318,843 79,535
U.S. Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Gross written premium 2,148,235 1,538,348 4,207,250 3,316,119
Net written premiums 2,059,919 1,424,089 3,972,868 3,037,183
Premiums earned 1,920,801 1,502,256 3,698,253 2,987,476
Incurred losses and LAE 1,168,139 1,005,677 2,440,045 2,026,319
Commission and brokerage 473,258 387,339 881,982 757,695
Other underwriting expenses 47,065 39,698 99,061 83,837
Underwriting gain (loss) 232,339 69,542 277,165 119,625
Insurance [Member]        
Segment Reporting Information [Line Items]        
Gross written premium 1,041,905 830,990 1,914,323 1,624,090
Net written premiums 749,492 593,389 1,390,479 1,181,774
Premiums earned 637,571 540,149 1,247,984 1,091,743
Incurred losses and LAE 418,002 401,339 857,515 811,537
Commission and brokerage 84,490 78,977 164,777 157,143
Other underwriting expenses 93,779 78,432 184,014 163,153
Underwriting gain (loss) $ 41,300 $ (18,599) $ 41,678 $ (40,090)