UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 523,892	$ 131,854
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 - Life Funds Withheld Assets	(93,914)	(197,367)
Net realized and unrealized (gains) losses on derivative instruments	7,975	2,716
Amortization of premiums (discounts) on fixed maturities	83,551	90,876
(Income) loss from investment and operating affiliates	(94,078)	(7,186)
Share-based compensation	29,959	43,226
Depreciation and amortization	36,567	58,643
Accretion of deposit liabilities	20,013	24,816
Changes in:
Unpaid losses and loss expenses	343,776	651,236
Future policy benefit reserves	(121,082)	(118,130)
Funds withheld on GreyCastle life retrocession arrangements, net	(219,050)	(133,839)
Unearned premiums	1,381,596	1,273,539
Premiums receivable	(1,280,244)	(1,835,783)
Unpaid losses and loss expenses recoverable	(257,264)	(189,376)
Ceded unearned premiums	(830,558)	(376,466)
Reinsurance balances receivable	(164,010)	(149,498)
Deferred acquisition costs and value of business acquired	(174,227)	(149,218)
Reinsurance balances payable	905,779	798,492
Deferred tax asset - net	9,058	(24,124)
Derivatives	21,701	50,682
Other assets	(118,147)	(118,265)
Other liabilities	(264,463)	(37,943)
Other	39,227	(59,506)
Total adjustments	(653,138)	63,347
Net cash provided by (used in) operating activities	(129,246)	195,201
Cash flows provided by (used in) investing activities:
Proceeds from sale of fixed maturities and short-term investments	6,387,610	7,449,955
Proceeds from redemption of fixed maturities and short-term investments	2,084,182	2,088,317
Proceeds from sale of equity securities	228,914	114,958
Purchases of fixed maturities and short term investments	(8,719,024)	(8,356,108)
Purchases of equity securities	(277,329)	(255,442)
Proceeds from sale of affiliates	236,861	153,928
Purchases of affiliates	(51,891)	(408,886)
Purchase of subsidiaries, net of cash acquired	0	(69,745)
Change in restricted cash	(27,726)	(26,866)
Other, net	5,127	108,095
Net cash provided by (used in) investing activities	(133,276)	798,206
Cash flows provided by (used in) financing activities:
Proceeds from issuance of ordinary shares and exercise of stock options	42,630	1,727
Buybacks of common shares	(450,629)	(684,386)
Employee withholding on share-based compensation	(23,957)	(27,947)
Dividends paid on common shares	(115,589)	(113,731)
Distributions to non-controlling interests	(73,708)	(65,682)
Contributions from non-controlling interests	25	1,130
Proceeds from Issuance of Long-term Debt	558,311	0
Repayment of debt	0	8,248
Deposit liabilities	(11,150)	(14,807)
Net cash provided by (used in) financing activities	(74,067)	(911,944)
Effects of exchange rate changes on foreign currency cash	43,423	(20,950)
Increase (decrease) in cash and cash equivalents	(293,166)	60,513
Cash and cash equivalents beginning of period	3,426,988	3,256,236
Cash and cash equivalents end of period	3,133,822	3,316,749
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	$ 84,697	$ 465,822