CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Net premiums earned	$ 1,091,312	$ 1,157,307	$ 3,283,941	$ 3,415,126
Net investment income	101,956	115,763	240,098	361,014
Other insurance related income (loss)	1,440	1,533	(5,270)	11,385
Net investment gains:
Allowance for expected credit losses	3,759	0	(2,498)	0
Impairment losses	(184)	0	(1,486)	0
Other-than-temporary impairment ("OTTI") losses	0	(1,458)	0	(6,328)
Other realized and unrealized investment gains	52,034	15,985	49,761	54,850
Total net investment gains	55,609	14,527	45,777	48,522
Total revenues	1,250,317	1,289,130	3,564,546	3,836,047
Expenses
Net losses and loss expenses	879,677	850,913	2,464,012	2,187,403
Acquisition costs	230,564	260,026	697,716	762,807
General and administrative expenses	138,823	155,522	436,538	496,008
Foreign exchange losses (gains)	60,734	(59,543)	8,760	(64,868)
Interest expense and financing costs	15,574	18,042	59,641	49,545
Reorganization expenses	1,413	11,215	822	29,310
Amortization of value of business acquired	1,028	4,368	4,111	24,666
Amortization of intangible assets	2,838	2,831	8,564	8,744
Total expenses	1,330,651	1,243,374	3,680,164	3,493,615
Income (loss) before income taxes and interest in income (loss) of equity method investments	(80,334)	45,756	(115,618)	342,432
Income tax (expense) benefit	12,056	(8,147)	6,030	(23,850)
Interest in income (loss) of equity method investments	2,896	792	(13,579)	5,645
Net income (loss)	(65,382)	38,401	(123,167)	324,227
Preferred share dividends	7,563	10,656	22,688	31,969
Net income (loss) available (attributable) to common shareholders	$ (72,945)	$ 27,745	$ (145,855)	$ 292,258
Earnings (loss) per common share:
Earnings (loss) per common share (in usd per share)	$ (0.87)	$ 0.33	$ (1.73)	$ 3.48
Earnings (loss) per diluted common share (in usd per share)	$ (0.87)	$ 0.33	$ (1.73)	$ 3.46
Weighted average common shares outstanding (in shares)	84,308	83,947	84,235	83,872
Weighted average diluted common shares outstanding (in shares)	84,308	84,582	84,235	84,420