SCHEDULE III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs		$ 629,372		$ 661,186	$ 644,952
Gross Reserves		9,064,711		9,745,806	10,646,318
Unearned Premiums		1,644,757		1,750,607	1,723,767
Other Benefits Payable		2,051,935		2,050,107	1,974,133
Premium Revenue		5,269,178		5,609,195	5,198,210
Net Investment Income(1)	[1]	449,784		479,696	484,367
Losses Incurred		3,157,420		3,462,770	3,157,808
Amortization of DAC		1,217,003		1,213,822	1,077,628
Other Expenses(2) (3)	[2]	790,723	[3]	449,688	500,466
Premiums Written		4,343,345		4,765,907	4,556,765
Non Life [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs		449,216		463,958	434,109
Gross Reserves		9,064,711		9,745,806	10,646,318
Unearned Premiums		1,629,537		1,731,212	1,699,393
Other Benefits Payable		0		0	0
Premium Revenue		4,059,665		4,387,406	4,234,850
Losses Incurred		2,193,449		2,462,568	2,399,867
Amortization of DAC		1,063,693		1,065,117	952,570
Other Expenses(2) (3)	[2]	218,319	[3]	252,322	258,997
Premiums Written		4,022,067		4,500,214	4,426,719
Life and Health [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs		180,156		197,228	210,841
Gross Reserves		0		0	0
Unearned Premiums		15,220		19,395	24,337
Other Benefits Payable		2,051,935		2,050,107	1,974,133
Premium Revenue		1,209,513		1,221,751	957,146
Net Investment Income(1)	[1]	58,537		60,369	60,897
Losses Incurred		964,421		1,000,202	760,552
Amortization of DAC		153,318		148,689	124,631
Other Expenses(2) (3)	[2]	63,451	[3]	67,811	71,092
Premiums Written		321,278		265,693	123,936
Corporate and Other [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs		0		0	2
Gross Reserves		0		0	0
Unearned Premiums		0		0	37
Other Benefits Payable		0		0	0
Premium Revenue		0		38	6,214
Net Investment Income(1)	[1]	391,247		419,327	423,470
Losses Incurred		(450)		0	(2,611)
Amortization of DAC		(8)		16	427
Other Expenses(2) (3)	[2]	508,953	[3]	129,555	170,377
Premiums Written		$ 0		$ 0	$ 6,110

[1] Because the Company does not manage its assets by segment, net investment income is not allocated to the Non-life segment of the reinsurance operations. However, because of the interest-sensitive nature of some of the Company’s Life products, net investment income is considered in Management’s assessment of the profitability of the Life and Health segment.

[2] Other expenses are a component of underwriting result for the Non-life and Life and Health segments. Other expenses included in Corporate and Other represent corporate expenses and other expenses related to the Company’s principal finance transactions, insurance-linked securities and strategic investments.

[3] Other expenses for the year ended December 31, 2015 include the AXIS Termination Fee and Transaction Costs.