Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule Of Underwriting Results For Operating Segments

	Three Months Ended					Six Months Ended
U.S. Reinsurance	June 30,					June 30,
(Dollars in thousands)	2019		2018			2019		2018
Gross written premiums	$	641,763	$	652,110		$	1,405,903	$	1,296,332
Net written premiums		487,694		429,931			1,105,835		853,762
Premiums earned	$	605,136	$	467,509		$	1,180,040	$	908,894
Incurred losses and LAE		367,473		708,524			684,111		1,009,728
Commission and brokerage		172,589		148,711			339,692		276,031
Other underwriting expenses		15,728		15,472			31,319		32,358
Underwriting gain (loss)	$	49,346	$	(405,198	)	$	124,918	$	(409,223	)

	Three Months Ended					Six Months Ended
International	June 30,					June 30,
(Dollars in thousands)	2019		2018			2019		2018
Gross written premiums	$	372,671	$	398,714		$	761,642	$	765,738
Net written premiums		350,219		337,357			708,077		672,232
Premiums earned	$	353,086	$	343,133		$	675,460	$	672,072
Incurred losses and LAE		213,808		259,487			450,884		435,846
Commission and brokerage		85,974		84,379			155,836		162,773
Other underwriting expenses		9,632		9,869			18,097		19,955
Underwriting gain (loss)	$	43,672	$	(10,602	)	$	50,643	$	53,498

	Three Months Ended				Six Months Ended
Insurance	June 30,				June 30,
(Dollars in thousands)	2019		2018		2019		2018
Gross written premiums	$	673,603	$	581,460	$	1,205,374	$	1,036,445
Net written premiums		481,952		423,066		898,196		771,387
Premiums earned	$	417,401	$	369,194	$	790,577	$	714,880
Incurred losses and LAE		261,941		260,749		504,323		496,441
Commission and brokerage		58,212		54,912		109,465		105,655
Other underwriting expenses		57,991		48,885		112,317		99,264
Underwriting gain (loss)	$	39,257	$	4,648	$	64,472	$	13,520

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)	2019			2018			2019			2018
Underwriting gain (loss)	$	132,275		$	(411,152	)	$	240,033		$	(342,205	)
Net investment income		90,709			72,070			175,243			141,979
Net realized capital gains (losses)		142,563			(42,271	)		277,619			(102,472	)
Corporate expense		(2,519	)		(1,513	)		(4,170	)		(5,109	)
Interest, fee and bond issue cost amortization expense		(9,684	)		(7,623	)		(19,512	)		(14,936	)
Other income (expense)		(3,812	)		77,682			(5,026	)		2,805
Income (loss) before taxes	$	349,532		$	(312,807	)	$	664,187		$	(319,938	)

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2019		2018		2019		2018
Canada gross written premiums	$	47,206	$	44,189	$	86,256	$	84,581