CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Net premiums earned	$ 9,777,934	$ 8,226,425	$ 5,895,070
Net investment income	827,133	872,370	918,625
Realized investment gains (losses):
Total net realized gains (losses) on investments, and net unrealized gains (losses) on investments, Trading	372,138	202,178	107,462
Net realized and unrealized gains (losses) on derivative instruments	2,521	53,123	29,886
Income (loss) from investment fund affiliates	70,758	73,320	95,816
Fee income and other	35,692	33,201	43,630
Total revenues	10,546,086	9,308,926	6,602,267
Expenses:
Net losses and loss expenses incurred	6,072,835	4,766,200	3,258,393
Claims and policy benefits	28,244	115,997	242,963
Acquisition costs	1,620,671	1,317,448	738,118
Operating expenses	2,063,362	1,966,939	1,341,315
Foreign exchange (gains) losses	(9,578)	22,504	(37,568)
Loss (gain) sale of subsidiaries	(7,088)	0	666,423
Extinguishment of debt	0	5,592	0
Interest expense	209,763	205,215	134,106
Total expenses	9,978,209	8,399,895	6,343,750
Income (loss) before income tax and income (loss) from operating affiliates	567,877	909,031	258,517
Income (loss) from operating affiliates	44,397	44,740	107,218
Gain on sale of operating affiliate	0	340,407	0
Provision (benefit) for income tax	42,129	(19,161)	96,897
Net income (loss)	570,145	1,313,339	268,838
Non-controlling interests	129,177	106,187	80,498
Net income (loss) attributable to common shareholders	$ 440,968	$ 1,207,152	$ 188,340
Weighted average ordinary shares and ordinary share equivalents outstanding - basic (in shares)	278,957	286,194	267,103
Weighted average ordinary shares and ordinary share equivalents outstanding - diluted (in shares)	282,758	290,999	271,527
Earnings (loss) per ordinary share and ordinary share equivalent - basic (in dollars per share)	$ 1.58	$ 4.22	$ 0.71
Earnings (loss) per ordinary share and ordinary share equivalent - diluted (in dollars per share)	$ 1.56	$ 4.15	$ 0.69
Exclude Life Funds Withheld Assets
Revenues:
Net investment income	$ 672,382	$ 684,881	$ 789,050
Realized investment gains (losses):
Net realized gains (losses) on investments sold	191,247	102,957	158,733
Other-than-temporary impairments (OTTI) on investments	(78,997)	(81,987)	(33,508)
OTTI on investments transferred to (from) other comprehensive income	439	(973)	(2,234)
Total net realized gains (losses) on investments, and net unrealized gains (losses) on investments, Trading	112,689	19,997	122,991
Life Funds Withheld Assets
Revenues:
Net investment income	154,751	187,489	129,575
Realized investment gains (losses):
Net realized gains (losses) on investments sold	152,589	223,272	5,067
Other-than-temporary impairments (OTTI) on investments	(2,598)	(13,357)	(20,587)
Net unrealized gains (losses) on investments, Trading - Life Funds Withheld Assets	109,458	(27,734)	(9)
Net realized and unrealized gains (losses) on derivative instruments	$ (540,090)	$ (151,691)	$ (488,222)