Condensed Consolidated Balance Sheets (Unaudited) Statement (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments
Fixed-maturities held to maturity—at amortized cost (fair value $420 and $676)	$ 427	$ 679
Fixed-maturities available for sale—at fair value (amortized cost $22,112 and $39,481)	21,880	40,696
Equity securities available for sale—at fair value (cost $78,106 and $88,260)	115,978	112,139
Trading securities—at fair value	3,722,975	4,094,622
Short-term investments at fair value	1,332,090	777,532
Other invested assets (including variable interest entity (“VIE”) assets of $76,959 and $78,006)	117,961	126,750
Total investments	5,311,311	5,152,418
Cash	31,831	31,555
Restricted cash	23,491	24,226
Deferred policy acquisition costs	70,427	88,202
Accrued investment income	33,106	34,349
Accounts and notes receivable	85,703	87,519
Property and equipment, at cost (less accumulated depreciation of $100,181 and $98,909)	6,672	7,456
Derivative assets (including VIE derivative assets of $1,575 and $1,585)	9,379	13,609
Deferred income taxes, net	17,902	0
Reinsurance recoverables	65,750	89,204
Other assets (including VIE other assets of $96,125 and $99,337)	398,428	374,662
Total assets	6,054,000	5,903,200
LIABILITIES AND STOCKHOLDERS’ EQUITY
Unearned premiums	712,706	648,682
Reserve for losses and loss adjustment expenses (“LAE”)	2,716,490	3,149,936
Reserve for premium deficiency (“PDR”)	4,308	3,685
Long-term debt	913,952	663,571
VIE debt—at fair value	106,767	108,858
Derivative liabilities (including VIE derivative liabilities of $64,637 and $70,467)	350,576	266,873
Accounts payable and accrued expenses (including VIE accounts payable of $338 and $366)	346,335	325,270
Total liabilities	5,151,134	5,166,875
Commitments and Contingencies (Note 15)
Stockholders’ equity
Common stock: par value $.001 per share; 485,000,000 and 325,000,000 shares authorized at June 30, 2013 and December 31, 2012, respectively;190,565,887 and 151,131,173 shares issued at June 30, 2013 and December 31, 2012, respectively; 173,028,101 and 133,647,216 shares outstanding at June 30, 2013 and December 31, 2012, respectively	191	151
Treasury stock, at cost: 17,537,786 and 17,483,957 shares at June 30, 2013 and December 31, 2012, respectively	(892,810)	(892,094)
Additional paid-in capital	2,346,932	1,967,414
Retained deficit	(575,913)	(355,241)
Accumulated other comprehensive income	24,466	16,095
Total stockholders’ equity	902,866	736,325
Total liabilities and stockholders’ equity	$ 6,054,000	$ 5,903,200