UNAUDITED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums earned	$ 2,600,288	$ 2,522,791
Net investment income	218,481	200,532
Realized investment gains (losses):
Total realized investment gains (losses)	(83,355)	37,286
Net realized and unrealized gains (losses) on derivative instruments	4,221	(7,069)
Income (loss) from investment affiliates	45,669	38,261
Fee income and other	6,717	13,661
Total revenues	2,814,942	2,755,361
Expenses:
Net losses and loss expenses incurred	1,622,006	1,583,456
Claims and policy benefits	10,307	7,291
Acquisition costs	463,827	435,869	[1]
Operating expenses	472,563	468,038
Foreign exchange (gains) losses	9,841	(3,336)
Interest expense	53,545	50,711
Total expenses	2,632,089	2,542,029
Income (loss) before income tax and income (loss) from operating affiliates	182,853	213,332
Income (loss) from operating affiliates	10,282	13,609
Provision (benefit) for income tax	31,902	13,092
Net income (loss)	161,233	213,849
Non-controlling interests	8,585	61,006
Net income (loss) attributable to common shareholders	$ 152,648	$ 152,843
Weighted average common shares outstanding - basic (in thousands of shares)	256,922	265,690
Weighted average common shares outstanding - diluted (in thousands of shares)	261,176	269,767
Earnings (loss) per common share and common share equivalent - basic (in dollars per share)	$ 0.59	$ 0.58
Earnings (loss) per common share and common share equivalent - diluted (in dollars per share)	$ 0.58	$ 0.57
Excluding Life Funds Withheld Assets
Revenues:
Net investment income	$ 188,083	$ 167,168
Realized investment gains (losses):
Net realized gains (losses) on investments AFS	(31,672)	11,092
Net realized and change in net unrealized gains (losses) on equity securities	(36,014)	0
Net realized and change in net unrealized gains (losses) on other investments	8,649	0
Other-than-temporary impairments	(1,645)	(6,874)
OTTI transferred to (from) other comprehensive income	(161)	0
Life Funds Withheld Assets
Revenues:
Net investment income	30,398	33,364
Realized investment gains (losses):
Other-than-temporary impairments	(1,203)	0
Net realized gains (losses) on investments and change in net unrealized gains (losses) on investments, trading - Life Funds Withheld Assets	(21,309)	33,068
Net realized and unrealized gains (losses) on derivative instruments	$ 22,921	$ (50,101)

[1] The Company has reflected the amortization of certain fair value adjustments recorded in conjunction with the Company's acquisition of Catlin Group Ltd in 2015 ("Catlin Acquisition") within the respective segments.