Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows used in operating activities	$ (165,971)	$ (154,447)
Cash flows from investing activities:
Proceeds from sales of fixed-maturity investments available for sale	1,102	15,973
Proceeds from sales of equity securities available for sale	0	3,154
Proceeds from sales of trading securities	380,030	450,214
Proceeds from redemptions of fixed-maturity investments available for sale	2,035	1,917
Proceeds from redemptions of fixed-maturity investments held to maturity	255	0
Purchases of trading securities	(232,538)	(304,512)
(Purchases)/sales and redemptions of short-term investments, net	(589,799)	116,130
Sales of other invested assets, net	2,005	682
Purchases of property and equipment, net	(362)	(381)
Net cash (used in) provided by investing activities	(437,272)	283,177
Cash flows from financing activities:
Dividends paid	(334)	(333)
Proceeds from issuance and exchange of long-term debt, net	381,165	0
Redemption of long-term debt	(79,372)	(132,215)
Issuance of common stock	299,542	0
Excess tax benefits from stock-based awards	50	0
Net cash provided by (used in) financing activities	601,051	(132,548)
Effect of exchange rate changes on cash	(29)	13
Decrease in cash	(2,221)	(3,805)
Cash, beginning of period	31,555	35,589
Cash, end of period	29,334	31,784
Supplemental disclosures of cash flow information:
Income taxes (received) paid	(1,983)	732
Interest paid	$ 3,630	$ 8,061