CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Investments:
Fixed maturities, at fair value (amortized cost: 2017 - $30,157,581; 2016 - $29,587,656)		$ 30,928,988	$ 30,256,602
Equity securities, at fair value (cost: 2017 - $638,455; 2016 - $996,610)		713,967	1,037,331
Short-term investments, at fair value (amortized cost: 2017 - $816,638; 2016 - $626,142)		815,481	625,193
Total investments available for sale		32,458,436	31,919,126
Fixed maturities, at fair value (amortized cost: 2017 - $1,946,501; 2016 - $1,548,178)		2,006,385	1,617,014
Short-term investments, at fair value (amortized cost: 2017 - $14,969; 2016 - $9,536)		14,965	9,563
Total investments trading		2,021,350	1,626,577
Investments in affiliates		1,911,996	2,177,645
Other investments		1,163,863	1,164,564
Total investments		37,555,645	36,887,912
Cash and cash equivalents		3,435,954	3,426,988
Restricted cash		157,497	153,504
Accrued investment income		272,149	284,366
Deferred acquisition costs and value of business acquired		1,102,474	946,721
Ceded unearned premiums		2,198,217	1,687,864
Premiums receivable		6,934,482	5,522,976
Reinsurance balances receivable		930,114	577,479
Unpaid losses and loss expenses recoverable		7,247,723	5,491,297
Receivable from investments sold		201,515	128,411
Goodwill and other intangible assets		2,225,751	2,203,653
Deferred tax asset		332,024	310,542
Other assets		842,691	812,389
Total assets		63,436,236	58,434,102
Liabilities:
Unpaid losses and loss expenses		29,696,779	25,939,571
Deposit liabilities		1,042,677	1,116,233
Future policy benefit reserves		3,610,926	3,506,047
Funds withheld on GreyCastle life retrocession arrangements (net of future policy benefit reserves recoverable: 2017 - $3,191,584; 2016 - $3,072,615)		999,219	998,968
Unearned premiums		8,307,431	7,293,028
Notes payable and debt	[1]	3,220,769	2,647,677
Reinsurance balances payable		3,706,116	2,451,717
Payable for investments purchased		332,989	226,009
Deferred tax liability		57,574	77,271
Other liabilities		1,000,436	1,216,902
Total liabilities		51,974,916	45,473,423
Commitments and Contingencies
Shareholders' Equity:
Authorized shares, 999,990,000, par value $0.01; common shares issued and outstanding (2017 - 256,033,895; 2016 - 266,889,127)		2,560	2,669
Additional paid in capital		7,757,940	8,068,503
Accumulated other comprehensive income		889,431	715,546
Retained earnings		1,198,386	2,151,794
Shareholders' equity attributable to XL Group Ltd		9,848,317	10,938,512
Non-controlling interest in equity of consolidated subsidiaries		1,613,003	2,022,167
Total shareholders' equity		11,461,320	12,960,679
Total liabilities and shareholders' equity		$ 63,436,236	$ 58,434,102

[1] "Outstanding" data represent December 31, 2017 and December 31, 2016 accreted values.