CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Net premiums earned	$ 1,157,307	$ 1,224,075	$ 3,415,126	$ 3,577,026
Net investment income	115,763	114,421	361,014	325,380
Other insurance related income	1,533	8,475	11,385	18,811
Net investment gains (losses):
Other-than-temporary impairment (OTTI) losses	(1,458)	(5,546)	(6,328)	(7,634)
Other realized and unrealized investment gains (losses)	15,985	(12,082)	54,850	(69,917)
Total net investment gains (losses)	14,527	(17,628)	48,522	(77,551)
Total revenues	1,289,130	1,329,343	3,836,047	3,843,666
Expenses
Net losses and loss expenses	850,913	794,959	2,187,403	2,162,945
Acquisition costs	260,026	248,314	762,807	709,527
General and administrative expenses	155,522	154,894	496,008	489,944
Foreign exchange losses (gains)	(59,543)	8,305	(64,868)	2,066
Interest expense and financing costs	18,042	16,897	49,545	50,758
Transaction and reorganization expenses	11,215	16,300	29,310	48,125
Amortization of value of business acquired	4,368	39,018	24,666	149,535
Amortization of intangible assets	2,831	1,753	8,744	8,564
Total expenses	1,243,374	1,280,440	3,493,615	3,621,464
Income before income taxes and interest in income of equity method investments	45,756	48,903	342,432	222,202
Income tax (expense) benefit	(8,147)	3,525	(23,850)	3,565
Interest in income of equity method investments	792	1,667	5,645	5,045
Net income	38,401	54,095	324,227	230,812
Preferred share dividends	10,656	10,656	31,969	31,969
Net income available to common shareholders	$ 27,745	$ 43,439	$ 292,258	$ 198,843
Earnings per common share:
Earnings per common share (in usd per share)	$ 0.33	$ 0.52	$ 3.48	$ 2.38
Earnings per diluted common share (in usd per share)	$ 0.33	$ 0.52	$ 3.46	$ 2.37
Weighted average common shares outstanding (in shares)	83,947	83,558	83,872	83,474
Weighted average diluted common shares outstanding (in shares)	84,582	84,107	84,420	83,939