Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2015

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)	2015		2014		2015		2014
Gross written premiums	$	451,059	$	453,115	$	1,013,706	$	983,416
Net written premiums		184,707		215,091		425,401		466,612
Premiums earned	$	235,426	$	246,265	$	490,838	$	464,456
Incurred losses and LAE		116,473		129,676		227,928		245,660
Commission and brokerage		34,703		53,380		93,067		93,516
Other underwriting expenses		11,807		11,453		23,336		20,935
Underwriting gain (loss)	$	72,443	$	51,756	$	146,507	$	104,345

	Three Months Ended				Six Months Ended
International	June 30,				June 30,
(Dollars in thousands)	2015		2014		2015		2014
Gross written premiums	$	311,653	$	466,008	$	645,268	$	794,886
Net written premiums		147,399		147,210		269,080		288,667
Premiums earned	$	157,922	$	147,728	$	298,621	$	292,732
Incurred losses and LAE		110,027		88,888		211,472		172,463
Commission and brokerage		31,243		27,412		65,242		56,581
Other underwriting expenses		8,049		8,093		16,164		15,930
Underwriting gain (loss)	$	8,603	$	23,335	$	5,743	$	47,758

	Three Months Ended						Six Months Ended
Insurance	June 30,						June 30,
(Dollars in thousands)	2015			2014			2015			2014
Gross written premiums	$	326,729		$	305,697		$	657,230		$	530,973
Net written premiums		140,358			130,426			286,410			237,152
Premiums earned	$	128,076		$	126,743		$	253,027		$	233,993
Incurred losses and LAE		96,379			102,953			192,359			181,440
Commission and brokerage		7,007			4,530			11,175			11,319
Other underwriting expenses		31,717			27,612			60,616			49,544
Underwriting gain (loss)	$	(7,027	)	$	(8,352	)	$	(11,123	)	$	(8,310	)

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)	2015			2014			2015			2014
Underwriting gain (loss)	$	74,019		$	66,739		$	141,127		$	143,793
Net investment income		70,925			68,636			143,506			132,423
Net realized capital gains (losses)		51,225			125,114			72,521			121,064
Corporate expense		(1,785	)		524			(3,394	)		(778	)
Interest, fee and bond issue cost amortization expense		(8,858	)		(8,811	)		(17,717	)		(16,247	)
Other income (expense)		12,289			(8,782	)		28,122			(11,837	)
Income (loss) before taxes	$	197,815		$	243,420		$	364,165		$	368,418

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)	2015		2014		2015		2014
Canada	$	30,160	$	36,830	$	53,672	$	74,489