Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows used in operating activities	$ (567,642)	$ (441,769)
Cash flows from investing activities:
Proceeds from sales of fixed-maturity investments available for sale	19,124	54,456
Proceeds from sales of equity securities available for sale	0	31,235
Proceeds from sales of trading securities	1,155,310	5,008,003
Proceeds from redemptions of fixed-maturity investments available for sale	7,721	4,459
Proceeds from redemptions of fixed-maturity investments held to maturity	255	1,505
Proceeds from redemptions of equity securities available for sale	10,503	0
Purchases of fixed-maturity investments available for sale	(80,758)	0
Purchases of trading securities	(507,034)	(4,933,850)
(Purchases)/sales and redemptions of short-term investments, net	(646,098)	481,673
Sales (purchases) of other invested assets, net	15,311	(73,684)
Proceeds from the sale of investment in affiliate	0	14,700
(Purchases)/sales of property and equipment, net	(3,677)	118
Net cash (used in) provided by investing activities	(29,343)	588,615
Cash flows from financing activities:
Dividends paid	(1,200)	(1,001)
Proceeds/payments related to issuance or exchange of debt, net	381,165	0
Redemption of long-term debt	(79,372)	(153,261)
Issuance of common stock	299,410	0
Excess tax benefits from stock-based awards	752	0
Net cash provided by (used in) financing activities	600,755	(154,262)
Effect of exchange rate changes on cash	0	(11)
Increase (decrease) in cash	3,770	(7,427)
Cash, beginning of period	31,555	35,589
Cash, end of period	35,325	28,162
Supplemental disclosures of cash flow information:
Income taxes paid	2,414	1,530
Interest paid	$ 18,172	$ 24,531