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Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2024
Reinsurance Disclosures [Abstract]  
Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned
The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

Quarter Ended June 30,
20242023
(dollars in thousands)DirectAssumedCededNet PremiumsDirectAssumedCededNet Premiums
Underwriting:
Written$2,356,536 $564,851 $(642,448)$2,278,939 $2,285,739 $448,837 $(526,562)$2,208,014 
Earned$2,149,773 $414,488 $(487,002)$2,077,259 $2,025,324 $424,404 $(418,264)$2,031,464 
Program services and other fronting:
Written943,140 847,603 (1,790,903)(160)824,171 229,438 (1,053,930)(321)
Earned811,377 240,844 (1,052,381)(160)649,562 159,075 (808,958)(321)
Consolidated:
Written$3,299,676 $1,412,454 $(2,433,351)$2,278,779 $3,109,910 $678,275 $(1,580,492)$2,207,693 
Earned$2,961,150 $655,332 $(1,539,383)$2,077,099 $2,674,886 $583,479 $(1,227,222)$2,031,143 

Six Months Ended June 30,
20242023
(dollars in thousands)DirectAssumedCededNet PremiumsDirectAssumedCededNet Premiums
Underwriting:
Written$4,464,003 $1,233,550 $(1,186,404)$4,511,149 $4,255,102 $1,137,732 $(966,591)$4,426,243 
Earned$4,348,011 $807,430 $(950,382)$4,205,059 $3,997,200 $823,123 $(820,704)$3,999,619 
Program services and other fronting:
Written1,688,098 1,266,878 (2,955,309)(333)1,397,382 433,981 (1,832,135)(772)
Earned1,515,059 364,115 (1,879,507)(333)1,290,675 233,792 (1,525,239)(772)
Consolidated:
Written$6,152,101 $2,500,428 $(4,141,713)$4,510,816 $5,652,484 $1,571,713 $(2,798,726)$4,425,471 
Earned$5,863,070 $1,171,545 $(2,829,889)$4,204,726 $5,287,875 $1,056,915 $(2,345,943)$3,998,847 
Effect Of Reinsurance And Retrocessional Reinsurance On Losses and Loss Adjustment Expenses
The following table summarizes the effect of reinsurance and retrocessional reinsurance on losses and loss adjustment expenses in the Company's underwriting operations.

Quarter Ended June 30, Six Months Ended June 30,
(dollars in thousands)2024202320242023
Gross losses and loss adjustment expenses$1,577,820 $1,476,189 $3,271,667 $2,868,537 
Ceded losses and loss adjustment expenses(345,224)(288,676)(751,391)(507,931)
Net losses and loss adjustment expenses$1,232,596 $1,187,513 $2,520,276 $2,360,606