UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows provided by (used in) operating activities:
Net income (loss)	$ (549,994)	$ 260,531
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Total net realized (gains) losses on investments and net unrealized (gains) losses on investments, Trading	(137,188)	(341,043)
Net realized and unrealized (gains) losses on derivative instruments	28,409	(2,774)
Amortization of premiums (discounts) on fixed maturities	122,474	143,855
(Income) loss from investment and operating affiliates	(135,415)	(25,915)
Loss (gain) on sale of subsidiaries	0	(3,670)
Share-based compensation	49,545	60,514
Depreciation and amortization	54,109	86,014
Accretion of deposit liabilities	17,002	33,133
Changes in:
Unpaid losses and loss expenses	3,241,151	820,938
Future policy benefit reserves	(162,815)	(156,804)
Funds withheld on GreyCastle life retrocession arrangements, net	(275,417)	(203,983)
Unearned premiums	785,513	731,463
Premiums receivable	(1,364,597)	(1,294,936)
Unpaid losses and loss expenses recoverable	(1,304,544)	(255,627)
Ceded unearned premiums	(547,700)	(122,856)
Reinsurance balances receivable	(478,040)	(111,238)
Deferred acquisition costs and value of business acquired	(90,796)	(88,261)
Reinsurance balances payable	1,140,535	587,682
Deferred tax asset - net	(18,397)	(11,015)
Derivatives	(25,629)	45,469
Other assets	(182,229)	(96,971)
Other liabilities	(221,046)	(13,801)
Other	122,524	(54,355)
Total adjustments	733,808	417,251
Net cash provided by (used in) operating activities	183,814	677,782
Cash flows provided by (used in) investing activities:
Proceeds from sale of fixed maturities and short-term investments	11,354,376	9,581,243
Proceeds from redemption of fixed maturities and short-term investments	2,794,515	3,010,158
Proceeds from sale of equity securities	456,889	411,330
Purchases of fixed maturities and short term investments	(14,456,346)	(11,557,045)
Purchases of equity securities	(314,752)	(611,086)
Proceeds from sale of affiliates	375,628	325,050
Purchases of affiliates	(119,835)	(556,548)
Purchase of subsidiaries, net of cash acquired	0	(92,893)
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	0	19,144
Change in restricted cash	(6,123)	4,874
Other, net	(37,147)	193,392
Net cash provided by (used in) investing activities	47,205	727,619
Cash flows provided by (used in) financing activities:
Proceeds from issuance of ordinary shares and exercise of stock options	49,640	5,735
Buybacks of common shares	(571,586)	(906,137)
Repurchase of preference shares	(411,492)	0
Employee withholding on share-based compensation	(24,156)	(28,171)
Dividends paid on common shares	(171,905)	(169,346)
Distributions to non-controlling interests	(109,213)	(93,470)
Contributions from non-controlling interests	49,474	6,394
Proceeds from Issuance of Long-term Debt	558,311	0
Repayment of debt	17,909	8,248
Deposit liabilities	(34,407)	(63,488)
Net cash provided by (used in) financing activities	(683,243)	(1,256,731)
Effects of exchange rate changes on foreign currency cash	55,324	(11,629)
Increase (decrease) in cash and cash equivalents	(396,900)	137,041
Cash and cash equivalents beginning of period	3,426,988	3,256,236
Cash and cash equivalents end of period	3,030,088	3,393,277
Life Funds Withheld Assets
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net realized and unrealized (gains) losses on derivative instruments	$ 116,359	$ 691,432