Unaudited Quarterly Financial Data

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Unaudited quarterly financial data

Unaudited Quarterly Financial Data

The following is a summary of the unaudited quarterly financial data for 2016 and 2015:

(U.S. dollars in thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2016
Net premiums earned – P&C operations	$	2,351,446	$	2,528,704	$	2,431,677	$	2,454,060
Net premiums earned – Corporate and Other	$	3,164	$	3,508	$	2,360	$	3,015
Underwriting profit (loss) – P&C operations	$	175,489	$	101,893	$	166,851	$	126,420
Net income (loss) attributable to common shareholders	$	21,885	$	43,782	$	70,601	$	304,700
Net income (loss) per common share and common equivalent – basic	$	0.07	$	0.16	$	0.26	$	1.13
Net income (loss) per common share and common equivalent – diluted	$	0.07	$	0.15	$	0.25	$	1.12
2015
Net premiums earned – P&C operations	$	1,319,494	$	2,063,795	$	2,405,740	$	2,375,155
Net premiums earned – Corporate and Other	$	14,506	$	18,258	$	17,812	$	11,665
Underwriting profit (loss) – P&C operations	$	146,836	$	208,779	$	114,118	$	183,458
Net income (loss) attributable to common shareholders	$	36,281	$	915,039	$	27,282	$	228,550
Net income (loss) per common share and common equivalent – basic	$	0.14	$	3.16	$	0.09	$	0.77
Net income (loss) per common share and common equivalent – diluted	$	0.14	$	3.11	$	0.09	$	0.76