Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2013

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)	2013		2012			2013		2012
Gross written premiums	$	418,367	$	135,469		$	853,158	$	504,950
Net written premiums		215,839		68,162			433,462		255,387
Premiums earned	$	199,254	$	164,146		$	396,199	$	348,013
Incurred losses and LAE		137,099		103,495			238,293		213,244
Commission and brokerage		38,540		54,651			76,670		99,828
Other underwriting expenses		9,994		10,021			20,528		20,775
Underwriting gain (loss)	$	13,621	$	(4,021	)	$	60,708	$	14,166

	Three Months Ended				Six Months Ended
International	June 30,				June 30,
(Dollars in thousands)	2013		2012		2013		2012
Gross written premiums	$	354,388	$	349,717	$	654,787	$	630,178
Net written premiums		162,557		160,199		296,346		296,528
Premiums earned	$	151,125	$	157,015	$	293,018	$	304,808
Incurred losses and LAE		89,883		97,888		171,966		162,528
Commission and brokerage		31,156		36,978		59,263		68,740
Other underwriting expenses		7,667		6,546		15,597		13,286
Underwriting gain (loss)	$	22,419	$	15,603	$	46,192	$	60,254

	Three Months Ended					Six Months Ended
Insurance	June 30,					June 30,
(Dollars in thousands)	2013		2012			2013			2012
Gross written premiums	$	307,550	$	247,693		$	556,106		$	454,942
Net written premiums		153,214		111,071			277,969			214,896
Premiums earned	$	139,643	$	117,309		$	248,811		$	219,360
Incurred losses and LAE		106,917		92,194			192,281			168,202
Commission and brokerage		5,669		1,736			7,554			12,288
Other underwriting expenses		26,623		24,532			51,681			46,552
Underwriting gain (loss)	$	434	$	(1,153	)	$	(2,705	)	$	(7,682	)

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)	2013			2012			2013			2012
Underwriting gain (loss)	$	36,474		$	10,429		$	104,195		$	66,738
Net investment income		81,736			74,206			158,605			155,448
Net realized capital gains (losses)		15,526			82,589			325,332			258,730
Corporate expense		(2,065	)		(1,732	)		(3,837	)		(3,298	)
Interest, fee and bond issue cost amortization expense		(17,928	)		(12,683	)		(30,544	)		(25,379	)
Other income (expense)		9,744			25,428			83			19,174
Income (loss) before taxes	$	123,487		$	178,237		$	553,834		$	471,413

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)	2013		2012		2013		2012
Canada	$	35,436	$	27,835	$	75,582	$	75,275