CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments
Debt instruments, trading, at fair value	$ 12,499	$ 1,763
Equity securities, trading, at fair value	1,030,207	1,042,715
Other investments, at fair value	107,246	133,450
Total investments	1,149,952	1,177,928
Cash and cash equivalents	83,683	21,890
Restricted cash and cash equivalents	1,316,584	1,206,837
Financial contracts receivable, at fair value	85,555	22,744
Reinsurance balances receivable	195,064	173,221
Loss and loss adjustment expenses recoverable	17,996	34,451
Deferred acquisition costs, net	62,083	59,177
Unearned premiums ceded	3,143	3,616
Notes receivable	15,784	19,330
Other assets	4,048	3,559
Total assets	2,933,892	2,722,753
Liabilities
Securities sold, not yet purchased, at fair value	1,065,072	908,368
Financial contracts payable, at fair value	17,962	19,637
Due to prime brokers	239,074	326,488
Loss and loss adjustment expense reserves	325,652	356,470
Unearned premium reserves	191,310	188,185
Reinsurance balances payable	38,922	35,292
Funds withheld	9,469	17,415
Other liabilities	12,018	10,488
Performance compensation payable to related party	33,818	0
Total liabilities	1,933,297	1,862,343
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, 30,622,458 (2012: 30,447,179): Class B: par value $0.10; authorized, 25,000,000; issued and outstanding, 6,254,949 (2012: 6,254,949))	3,688	3,670
Additional paid-in capital	495,610	492,469
Retained earnings	467,338	325,569
Shareholders' equity attributable to shareholders	966,636	821,708
Non-controlling interest in joint venture	33,959	38,702
Total equity	1,000,595	860,410
Total liabilities and equity	$ 2,933,892	$ 2,722,753