Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 222,467	$ 244,319
Adjustments to reconcile net income to net cash provided by operating activities	15,478	(174,105)
Net Cash Provided By Operating Activities	237,945	70,214
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	262,518	226,492
Proceeds from maturities, calls and prepayments of fixed maturities	676,023	471,907
Cost of fixed maturities and equity securities purchased	(939,314)	(1,324,755)
Net change in short-term investments	677,968	(348,335)
Proceeds from sales of equity method investments	2,881	6,479
Additions to property and equipment	(35,578)	(34,634)
Acquisitions, net of cash acquired	(202,033)	(5,762)
Other	(5,689)	(1,731)
Net Cash Provided (Used) By Investing Activities	436,776	(1,010,339)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	29,898	533,235
Repayment of senior long-term debt and other debt	(139,564)	(228,836)
Premiums and fees related to early extinguishment of debt	0	(43,691)
Repurchases of common stock	(59,194)	(15,206)
Issuance of common stock	359	4,101
Purchase of noncontrolling interests	(18,068)	(3,078)
Distributions to noncontrolling interests	(4,345)	(3,187)
Other	(7,705)	(13,428)
Net Cash Provided (Used) By Financing Activities	(198,619)	229,910
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	24,977	1,912
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	501,079	(708,303)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	2,085,164	3,070,141
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD	$ 2,586,243	$ 2,361,838