Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2017

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)	2017		2016			2017		2016
Gross written premiums	$	474,992	$	405,530		$	1,053,951	$	942,236
Net written premiums		135,177		161,031			354,239		384,458
Premiums earned	$	202,289	$	224,618		$	410,603	$	459,861
Incurred losses and LAE		119,747		110,152			240,181		226,322
Commission and brokerage		43,173		50,130			83,545		99,861
Other underwriting expenses		14,278		12,133			28,529		25,591
Underwriting gain (loss)	$	25,091	$	52,203		$	58,348	$	108,087

	Three Months Ended				Six Months Ended
International	June 30,				June 30,
(Dollars in thousands)	2017		2016		2017		2016
Gross written premiums	$	333,535	$	348,178	$	612,110	$	586,656
Net written premiums		111,961		124,438		215,207		212,154
Premiums earned	$	113,300	$	131,285	$	231,451	$	244,458
Incurred losses and LAE		78,459		91,427		146,873		164,842
Commission and brokerage		23,790		26,140		47,325		52,250
Other underwriting expenses		9,163		7,969		18,052		15,792
Underwriting gain (loss)	$	1,888	$	5,749	$	19,201	$	11,574

	Three Months Ended						Six Months Ended
Insurance	June 30,						June 30,
(Dollars in thousands)	2017			2016			2017			2016
Gross written premiums	$	527,047		$	424,083		$	921,898		$	778,803
Net written premiums		170,774			155,786			297,302			308,712
Premiums earned	$	152,608		$	132,952		$	297,198		$	266,461
Incurred losses and LAE		99,022			136,957			199,896			243,434
Commission and brokerage		(6,450	)		(5,861	)		(17,850	)		(15,337	)
Other underwriting expenses		40,756			38,228			77,511			76,174
Underwriting gain (loss)	$	19,280		$	(36,372	)	$	37,641		$	(37,810	)

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)	2017			2016			2017			2016
Underwriting gain (loss)	$	46,259		$	21,580		$	115,190		$	81,851
Net investment income		71,900			73,872			132,749			132,317
Net realized capital gains (losses)		(92,291	)		29,165			25,477			(37,212	)
Corporate expense		(1,512	)		(2,010	)		(5,109	)		(4,346	)
Interest, fee and bond issue cost amortization expense		(7,954	)		(8,858	)		(16,813	)		(17,717	)
Other income (expense)		10,655			(10,700	)		20,510			2,402
Income (loss) before taxes	$	27,057		$	103,049		$	272,004		$	157,295

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)	2017		2016		2017		2016
Canada gross written premiums	$	36,195	$	34,630	$	64,152	$	58,216