Condensed Consolidated Balance Sheets (Unaudited) Statement (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Fixed-maturities held to maturity—at amortized cost (fair value $50 and $351)	$ 50	$ 358
Fixed-maturities available for sale—at fair value (amortized cost $212,734 and $120,385)	213,989	120,553
Equity securities available for sale—at fair value (cost $78,106 and $78,106)	137,920	135,168
Trading securities—at fair value	2,728,976	3,117,429
Short-term investments—at fair value	1,649,228	1,429,228
Other invested assets—(including variable interest entity (“VIE”) assets at fair value of $81,635 and $81,000)	128,416	128,421
Total investments	4,858,579	4,931,157
Cash	20,963	23,858
Restricted cash	22,366	22,527
Deferred policy acquisition costs	63,708	66,926
Accrued investment income	27,690	30,264
Accounts and notes receivable	75,072	75,106
Property and equipment, at cost (less accumulated depreciation of $102,436 and $101,625)	12,482	10,516
Derivative assets	14,466	16,642
Deferred income taxes, net	0	17,902
Reinsurance recoverables	31,033	46,846
Other assets (including VIE other assets of $92,594 and $92,023)	402,626	379,947
Total assets	5,528,985	5,621,691
LIABILITIES AND STOCKHOLDERS’ EQUITY
Unearned premiums	774,788	768,871
Reserve for losses and loss adjustment expenses (“LAE”)	1,923,711	2,185,421
Long-term debt	938,390	930,072
VIE debt—at fair value	95,580	94,645
Derivative liabilities (including VIE derivative liabilities of $47,769 and $68,457)	257,717	307,185
Other liabilities (including VIE accounts payable of $190 and $254)	392,216	395,852
Total liabilities	4,382,402	4,682,046
Commitments and Contingencies (Note 15)
Equity component of currently redeemable convertible senior notes	91,016	0
Stockholders’ equity
Common stock: par value $.001 per share; 485,000,000 shares authorized at March 31, 2014 and December 31, 2013; 190,712,673 and 190,636,972 shares issued at March 31, 2014 and December 31, 2013, respectively; 173,166,892 and 173,099,515 shares outstanding at March 31, 2014 and December 31, 2013, respectively	191	191
Treasury stock, at cost: 17,545,781 and 17,537,457 shares at March 31, 2014 and December 31, 2013, respectively	(892,937)	(892,807)
Additional paid-in capital	2,256,436	2,347,104
Retained deficit	(349,467)	(552,226)
Accumulated other comprehensive income	41,344	37,383
Total stockholders’ equity	1,055,567	939,645
Total liabilities and stockholders’ equity	$ 5,528,985	$ 5,621,691