Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES
Net income (loss)	$ (1,401,376)	$ 577,513
Adjustments to reconcile net income (loss) to net cash provided by operating activities	1,467,054	(558,790)
Net Cash Provided By Operating Activities	65,678	18,723
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	266,421	133,453
Proceeds from maturities, calls and prepayments of fixed maturities	104,226	128,449
Cost of fixed maturities and equity securities purchased	(382,415)	(227,556)
Net change in short-term investments	942,695	329,659
Proceeds from sale of equity and cost method investments	15,167	55
Additions to property and equipment	(29,907)	(24,756)
Proceeds from disposals of fixed assets	381	13,955
Acquisitions, net of cash acquired	0	(9,400)
Other	(9,949)	(1,739)
Net Cash Provided By Investing Activities	906,619	342,120
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	89,428	87,356
Repayment of senior long-term debt and other debt	(30,274)	(36,100)
Repurchases of common stock	(23,865)	(37,649)
Purchase of noncontrolling interests	(11,483)	(9,754)
Distributions to noncontrolling interests	(1,842)	(2,808)
Other	(1,057)	(1,114)
Net Cash Provided (Used) By Financing Activities	20,907	(69)
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	(35,233)	7,199
Increase in cash, cash equivalents, restricted cash and restricted cash equivalents	957,971	367,973
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	3,500,353	2,396,432
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD	$ 4,458,324	$ 2,764,405