Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Equity securities, trading, at fair value (cost - $1,004,245; 2013 - $824,723)	$ 1,116,554	$ 954,111
Debt securities, trading, at fair value (cost - $508,286; 2013 - $408,754)	558,648	441,424
Other investments, at fair value	77,387	65,329
Total investments in securities and commodities	1,752,589	1,460,864
Cash and cash equivalents	33,938	31,625
Restricted cash and cash equivalents	221,044	193,577
Due from brokers	101,819	98,386
Securities purchased under an agreement to sell	36,778	38,147
Derivative assets, at fair value	28,134	39,045
Interest and dividends receivable	5,214	2,615
Reinsurance balances receivable	221,541	191,763
Deferred acquisition costs, net	93,283	91,193
Loss and loss adjustment expenses recoverable	10,277	9,277
Other assets	2,950	3,398
Total assets	2,507,567	2,159,890
Liabilities
Accounts payable and accrued expenses	3,739	9,456
Reinsurance balances payable	25,647	9,081
Deposit liabilities	121,374	120,946
Unearned premium reserves	279,512	265,187
Loss and loss adjustment expense reserves	164,624	134,331
Securities sold, not yet purchased, at fair value	53,958	56,056
Due to brokers	333,478	44,870
Derivative liabilities, at fair value	7,569	8,819
Performance fee payable to related party	12,295	0
Interest and dividends payable	800	748
Total liabilities	1,002,996	649,494
Commitments and contingent liabilities	0	0
Shareholders' equity
Preference shares (par value $0.10; authorized, 30,000,000; none issued)	0	0
Common shares (par value $0.10; authorized, 300,000,000; issued and outstanding, 103,924,897 (2013: 103,888,916))	10,392	10,389
Additional paid-in capital	1,057,939	1,055,690
Retained earnings	365,361	325,582
Shareholders’ equity attributable to shareholders	1,433,692	1,391,661
Non-controlling interests	70,879	118,735
Total shareholders' equity	1,504,571	1,510,396
Total liabilities and shareholders' equity	$ 2,507,567	$ 2,159,890