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Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule Of Underwriting Results For Operating Segments

Reinsurance	Years Ended December 31,
(Dollars in thousands)	2020			2019			2018
Gross written premiums	$	7,281,716		$	6,355,889		$	6,224,601
Net written premiums		6,767,579			5,732,272			5,706,453
Premiums earned	$	6,466,106		$	5,491,296		$	5,293,071
Incurred losses and LAE		4,933,411			3,675,178			4,585,602
Commission and brokerage		1,552,371			1,400,247			1,251,581
Other underwriting expenses		175,734			160,834			142,874
Underwriting gain (loss)	$	(195,410)		$	255,037		$	(686,986)

Insurance	Years Ended December 31,
(Dollars in thousands)	2020			2019			2018
Gross written premiums	$	3,200,645		$	2,777,475		$	2,250,552
Net written premiums		2,349,404			2,092,152			1,707,975
Premiums earned	$	2,215,407		$	1,912,390		$	1,638,628
Incurred losses and LAE		1,617,426			1,247,720			1,065,801
Commission and brokerage		320,879			303,479			267,449
Other underwriting expenses		335,503			280,065			228,667
Underwriting gain (loss)	$	(58,401)		$	81,126		$	76,711

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

	Years Ended December 31,
(Dollars in thousands)	2020			2019			2018
Underwriting gain (loss)	$	(253,811)		$	336,163		$	(610,275)
Net investment income		642,465			647,139			581,183
Net realized capital gains (losses)		267,649			185,004			(127,136)
Corporate expenses		(41,118)			(32,966)			(30,672)
Interest, fee and bond issue cost amortization expense		(36,323)			(31,693)			(31,031)
Other income (expense)		6,487			(4,660)			(24,251)
Income (loss) before taxes	$	585,349		$	1,098,987		$	(242,182)

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

	Year Ended December 31,
(Dollars in thousands)	2020			2019			2018
United Kingdom gross written premium	$	1,116,363		$	964,358		$	914,612

X

- Definition

Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

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Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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