Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash used in operating activities, continuing operations	$ (66,804)	$ (236,753)
Net cash used in operating activities, discontinued operations	(1,759)	(23,107)
Net cash used in operating activities	(68,563)	(259,860)
Cash flows from investing activities:
Proceeds from sales of fixed-maturity investments available for sale	57,309	9,802
Proceeds from sales of equity securities available for sale	145,550	0
Proceeds from sales and redemptions of trading securities	134,427	432,248
Proceeds from redemptions of fixed-maturity investments available for sale	25,179	100
Proceeds from redemptions of fixed-maturity investments held to maturity	0	300
Purchases of fixed-maturity investments available for sale	(725,640)	(165,256)
Purchases of equity securities available for sale	(500)	0
Purchases and redemptions of short-term investments, net	(348,702)	(197,299)
Sales of other assets, net	965	6,750
Proceeds from Divestiture of Businesses, Net of Cash Divested	784,866	0
Purchases of property and equipment, net	(10,654)	(8,041)
Acquisitions, net of cash acquired	(6,449)	(295,977)
Net cash provided by (used in) investing activities, continuing operations	56,351	(217,373)
Net cash provided by investing activities, discontinued operations	4,999	14,740
Net cash provided by (used in) investing activities	61,350	(202,633)
Cash flows from financing activities:
Dividends paid	(958)	(910)
Issuance of long-term debt, net	344,260	294,402
Purchases and redemptions of long-term debt	(128,303)	(57,223)
Proceeds from termination of capped calls	11,973	0
Issuance of common stock	0	247,388
Purchase of shares under ASR	(202,000)	0
Excess tax benefits from stock-based awards	2,679	106
Net cash provided by financing activities, continuing operations	27,651	483,763
Net cash provided by (used in) financing activities, discontinued operations	0	0
Net cash provided by financing activities	27,651	483,763
Effect of exchange rate changes on cash	57	(13)
Increase in cash	20,495	21,257
Cash, beginning of period	30,465	22,880
Less: Change in cash of business held for sale	(421)	1,758
Cash, end of period	51,381	42,379
Supplemental disclosures of cash flow information:
Income taxes paid	3,786	5,333
Interest paid	$ 29,547	$ 21,558