Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Schedule Of Underwriting Results For Operating Segments

	Three Months Ended				Six Months Ended
Reinsurance	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
Gross written premiums	$	1,538,348	$	1,409,587	$	3,316,119	$	2,941,638
Net written premiums		1,424,089		1,234,686		3,037,183		2,629,239
Premiums earned	$	1,502,256	$	1,343,760	$	2,987,476	$	2,651,279
Incurred losses and LAE		1,005,677		783,082		2,026,319		1,555,280
Commission and brokerage		387,339		345,378		757,695		668,015
Other underwriting expenses		39,698		37,430		83,837		73,199
Underwriting gain (loss)	$	69,542	$	177,870	$	119,625	$	354,785

	Three Months Ended				Six Months Ended
Insurance	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
Gross written premiums	$	830,990	$	757,068	$	1,624,090	$	1,352,125
Net written premiums		593,389		549,297		1,181,774		1,006,442
Premiums earned	$	540,149	$	473,539	$	1,091,743	$	898,717
Incurred losses and LAE		401,339		311,548		811,537		587,900
Commission and brokerage		78,977		75,572		157,143		142,409
Other underwriting expenses		78,432		67,403		163,153		130,619
Underwriting gain (loss)	$	(18,599)	$	19,016	$	(40,090)	$	37,789

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
Underwriting gain (loss)	$	50,943	$	196,886	$	79,535	$	392,574
Net investment income		38,083		179,028		185,883		320,004
Net realized capital gains (losses)		184,648		30,272		(25,940)		122,504
Net derivative gain (loss)		11,869		353		(3,504)		3,584
Corporate expenses		(8,733)		(7,535)		(18,566)		(14,187)
Interest, fee and bond issue cost amortization expense		(7,253)		(8,434)		(14,836)		(16,065)
Other income (expense)		(32,490)		(18,225)		(9,127)		(21,525)
Income (loss) before taxes	$	237,067	$	372,345	$	193,445	$	786,889

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
United Kingdom gross written premium	$	236,100	$	207,140	$	542,808	$	470,997