Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows used in operating activities	$ (291,570)	$ (361,899)
Cash flows from investing activities:
Proceeds from sales of fixed-maturity investments available for sale	16,049	44,935
Proceeds from sales of equity securities available for sale	0	30,727
Proceeds from sales of trading securities	630,435	2,066,088
Proceeds from redemptions of fixed-maturity investments available for sale	2,415	3,738
Proceeds from redemptions of fixed-maturity investments held to maturity	255	250
Proceeds from redemptions of equity securities available for sale	10,503	0
Purchases of trading securities	(429,001)	(2,137,677)
(Purchases)/sales and redemptions of short-term investments, net	(554,429)	556,048
Sales (purchases) of other invested assets, net	15,210	(74,999)
Proceeds from the sale of investment in affiliate	0	14,700
Purchases of property and equipment, net	(712)	(452)
Net cash (used in) provided by investing activities	(309,275)	503,358
Cash flows from financing activities:
Dividends paid	(767)	(666)
Proceeds/payments related to issuance or exchange of debt, net	381,165	0
Redemption of long-term debt	(79,372)	(143,770)
Issuance of common stock	299,542	0
Excess tax benefits from stock-based awards	553	0
Net cash provided by (used in) financing activities	601,121	(144,436)
Effect of exchange rate changes on cash	0	5
Increase (decrease) in cash	276	(2,972)
Cash, beginning of period	31,555	35,589
Cash, end of period	31,831	32,617
Supplemental disclosures of cash flow information:
Income taxes (received) paid	1,785	1,498
Interest paid	$ 15,970	$ 21,820