Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule Of Underwriting Results For Operating Segments

U.S. Reinsurance	Years Ended December 31,
(Dollars in thousands)	2019		2018		2017
Gross written premiums	$	2,962,416	$	3,014,338	$	2,592,972
Net written premiums		2,513,579		2,642,182		2,245,422
Premiums earned	$	2,471,447	$	2,528,991	$	2,181,160
Incurred losses and LAE		1,514,151		2,784,181		1,632,795
Commission and brokerage		703,803		568,374		462,487
Other underwriting expenses		68,796		60,266		55,881
Underwriting gain (loss)	$	184,697	$	(883,830)	$	29,997

International	Years Ended December 31,
(Dollars in thousands)	2019		2018		2017
Gross written premiums	$	1,648,598	$	1,543,946	$	1,316,701
Net written premiums		1,551,753		1,458,745		1,229,597
Premiums earned	$	1,475,669	$	1,439,882	$	1,202,043
Incurred losses and LAE		1,193,816		992,704		1,059,640
Commission and brokerage		342,400		364,010		287,688
Other underwriting expenses		41,690		39,042		38,844
Underwriting gain (loss)	$	(102,237)	$	44,126	$	(184,129)

Bermuda	Years Ended December 31,
(Dollars in thousands)	2019		2018		2017
Gross written premiums	$	1,744,875	$	1,666,317	$	1,205,001
Net written premiums		1,666,940		1,605,526		1,139,082
Premiums earned	$	1,544,180	$	1,324,198	$	1,093,250
Incurred losses and LAE		967,211		808,717		735,292
Commission and brokerage		354,044		319,197		303,707
Other underwriting expenses		50,348		43,566		38,011
Underwriting gain (loss)	$	172,577	$	152,718	$	16,240

Insurance	Years Ended December 31,
(Dollars in thousands)	2019		2018		2017
Gross written premiums	$	2,777,475	$	2,250,552	$	2,059,248
Net written premiums		2,092,152		1,707,975		1,630,560
Premiums earned	$	1,912,390	$	1,638,628	$	1,461,387
Incurred losses and LAE		1,247,720		1,065,801		1,094,854
Commission and brokerage		303,479		267,449		250,081
Other underwriting expenses		280,065		228,667		186,081
Underwriting gain (loss)	$	81,126	$	76,711	$	(69,629)

Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes

	Years Ended December 31,
(Dollars in thousands)	2019		2018		2017
Underwriting gain (loss)	$	336,163	$	(610,275)	$	(207,521)
Net investment income		647,139		581,183		542,898
Net realized capital gains (losses)		185,004		(127,136)		153,194
Net derivative gain (loss)		6,374		520		9,581
Corporate expenses		(32,966)		(30,672)		(25,923)
Interest, fee and bond issue cost amortization expense		(31,693)		(31,031)		(31,603)
Other income (expense)		(11,034)		(24,771)		(21,215)
Income (loss) before taxes	$	1,098,987	$	(242,182)	$	419,411

Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market

	Year Ended December 31,
(Dollars in thousands)	2019		2018		2017
United Kingdom gross written premium	$	964,358	$	914,612	$	730,826