Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2020

Unaudited Quarterly Financial Data [Abstract]

Summary Of Quarterly Financial Data

	2020
(Dollars in thousands)	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
Operating data:
Gross written premiums	$	1,974,965	$	1,838,247	$	2,064,961	$	2,078,865
Net written premiums		1,638,708		1,501,550		1,725,701		1,772,741
Premiums earned		1,494,005		1,538,960		1,615,457		1,758,154
Net investment income		74,201		35,153		135,428		131,124
Net realized capital gains (losses)		256,867		(479,360)		115,193		157,104
Total claims and underwriting expenses		1,465,006		1,436,098		1,720,362		1,812,710
Net income (loss)		316,645		(270,593)		119,806		186,015

	2019
(Dollars in thousands)	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
Operating data:
Gross written premiums	$	1,684,882	$	1,688,038	$	1,890,002	$	1,790,142
Net written premiums		1,392,243		1,319,865		1,569,954		1,492,886
Premiums earned		1,270,454		1,375,623		1,428,400		1,414,558
Net investment income		84,534		90,709		95,592		85,376
Net realized capital gains (losses)		135,056		142,563		112,542		29,206
Total claims and underwriting expenses		1,174,175		1,255,551		1,562,452		1,505,892
Net income (loss)		251,608		280,922		61,137		36,060