CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investments
Debt instruments, trading, at fair value	$ 9,088	$ 10,639
Equity securities, trading, at fair value	1,058,729	890,822
Other investments, at fair value	138,513	128,685
Total investments	1,206,330	1,030,146
Cash and cash equivalents	11,262	42,284
Restricted cash and cash equivalents	922,889	957,462
Financial contracts receivable, at fair value	23,972	23,673
Reinsurance balances receivable	179,958	141,278
Loss and loss adjustment expenses recoverable	36,911	29,758
Deferred acquisition costs, net	60,321	68,725
Unearned premiums ceded	11,929	27,233
Notes receivable	19,082	17,437
Other assets	4,755	5,492
Total assets	2,477,409	2,343,488
Liabilities
Securities sold, not yet purchased, at fair value	663,542	683,816
Financial contracts payable, at fair value	12,972	6,324
Due to prime brokers	365,007	260,359
Loss and loss adjustment expense reserves	294,647	241,279
Unearned premium reserves	208,766	225,735
Reinsurance balances payable	37,947	32,192
Funds withheld	33,185	38,031
Other liabilities	7,777	10,054
Performance compensation payable to related party	7,870	0
Total liabilities	1,631,713	1,497,790
Shareholders’ equity
Preferred share capital (par value $0.10; authorized, 50,000,000; none issued)	0	0
Ordinary share capital (Class A: par value $0.10; authorized, 100,000,000; issued and outstanding, 30,423,704 (2011: 30,283,200): Class B: par value $0.10; authorized, 25,000,000; issued and outstanding, 6,254,949 (2011: 6,254,949))	3,668	3,654
Additional paid-in capital	490,215	488,478
Retained earnings	340,035	310,971
Shareholders' equity attributable to shareholders	833,918	803,103
Non-controlling interest in joint venture	11,778	42,595
Total equity	845,696	845,698
Total liabilities and equity	$ 2,477,409	$ 2,343,488