CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Net premiums earned	$ 981,431	$ 946,990	$ 1,920,133	$ 1,849,331
Net investment income	106,063	91,730	204,728	140,896
Other insurance related income (losses)	2,560	(892)	(1,222)	(1,094)
Bargain purchase gain	15,044	0	15,044	0
Net realized investment gains (losses):
Other-than-temporary impairment (OTTI) losses	(1,528)	(6,369)	(8,082)	(16,099)
Other realized investment gains (losses)	(2,864)	27,379	(21,361)	(29,401)
Total net realized investment gains (losses)	(4,392)	21,010	(29,443)	(45,500)
Total revenues	1,100,706	1,058,838	2,109,240	1,943,633
Expenses
Net losses and loss expenses	605,332	632,294	1,212,273	1,131,256
Acquisition costs	204,361	189,125	394,153	369,761
General and administrative expenses	147,816	146,746	309,075	296,648
Foreign exchange losses (gains)	36,118	(56,602)	57,583	(55,986)
Interest expense and financing costs	12,751	12,914	25,543	25,747
Total expenses	1,006,378	924,477	1,998,627	1,767,426
Income before income taxes and interest in income (loss) of equity method investments	94,328	134,361	110,613	176,207
Income tax (expense) benefit	3,333	(4,901)	12,670	1,639
Interest in loss of equity method investments	(1,975)	0	(7,741)	0
Net income	95,686	129,460	115,542	177,846
Preferred share dividends	10,656	9,969	25,497	19,938
Net income available to common shareholders	$ 85,030	$ 119,491	$ 90,045	$ 157,908
Net income per common share:
Basic net income (in usd per share)	$ 1.01	$ 1.30	$ 1.06	$ 1.70
Diluted net income (in usd per share)	$ 1.01	$ 1.29	$ 1.05	$ 1.69
Weighted average number of common shares outstanding - basic (in shares)	84,141	91,926	85,076	92,980
Weighted average number of common shares outstanding - diluted (in shares)	84,511	92,558	85,647	93,705
Cash dividends declared per common share (in usd per share)	$ 0.38	$ 0.35	$ 0.76	$ 0.70