CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Revenues:
Net premiums earned	$ 10,336,612		$ 9,777,934	$ 8,226,425
Net investment income	829,723		827,133	872,370
Realized investment gains (losses):
Total net realized gains (losses) on investments, and net unrealized gains (losses) on investments, Trading	221,876		372,138	202,178
Net realized and unrealized gains (losses) on derivative instruments	(41,732)		2,521	53,123
Income (loss) from investment fund affiliates	139,046		70,758	73,320
Fee income and other	48,647		35,692	33,201
Total revenues	11,328,157		10,546,086	9,308,926
Expenses:
Net losses and loss expenses incurred	8,001,920		6,072,835	4,766,200
Claims and policy benefits	39,189		28,244	115,997
Acquisition costs	1,788,140		1,620,671	1,317,448
Operating expenses	1,757,059		2,063,362	1,966,939
Foreign exchange (gains) losses	44,620		(9,578)	22,504
Loss (gain) sale of subsidiaries	0		(7,088)	0
Extinguishment of debt	1,582		0	5,592
Interest expense	190,359		209,763	205,215
Total expenses	11,822,869		9,978,209	8,399,895
Income (loss) before income tax and income (loss) from operating affiliates	(494,712)		567,877	909,031
Income (loss) from operating affiliates	63,645		44,397	44,740
Gain on sale of operating affiliate	0		0	340,407
Provision (benefit) for income tax	59,070		42,129	(19,161)
Net income (loss)	(490,137)		570,145	1,313,339
Non-controlling interests	70,261		129,177	106,187
Net income (loss) attributable to common shareholders	$ (560,398)		$ 440,968	$ 1,207,152
Weighted average ordinary shares and ordinary share equivalents outstanding - basic (in shares)	259,894		278,957	286,194
Weighted average ordinary shares and ordinary share equivalents outstanding - diluted (in shares)	259,894		282,758	290,999
Earnings (loss) per ordinary share and ordinary share equivalent - basic (in dollars per share)	$ (2.16)		$ 1.58	$ 4.22
Earnings (loss) per ordinary share and ordinary share equivalent - diluted (in dollars per share)	$ (2.16)	[1]	$ 1.56	$ 4.15
Exclude Life Funds Withheld Assets
Revenues:
Net investment income	$ 702,676		$ 672,382	$ 684,881
Realized investment gains (losses):
Net realized gains (losses) on investments sold	135,551		191,247	102,957
Other-than-temporary impairments (OTTI) on investments	(12,988)		(78,997)	(81,987)
OTTI on investments transferred to (from) other comprehensive income	(359)		439	(973)
Total net realized gains (losses) on investments, and net unrealized gains (losses) on investments, Trading	122,204		112,689	19,997
Life Funds Withheld Assets
Revenues:
Net investment income	127,047		154,751	187,489
Realized investment gains (losses):
Net realized gains (losses) on investments sold	115,911		152,589	223,272
Other-than-temporary impairments (OTTI) on investments	(1,434)		(2,598)	(13,357)
Net unrealized gains (losses) on investments, Trading - Life Funds Withheld Assets	(14,805)		109,458	(27,734)
Net realized and unrealized gains (losses) on derivative instruments	$ (206,015)		$ (540,090)	$ (151,691)

[1] Due to the net loss in the period, basic and diluted earnings per common share are calculated using the basic weighted average common shares outstanding for the year ended December 31, 2017. The shares excluded from the calculation amounted to approximately 3.7 million.