Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES
Net income	$ 1,083,996	$ 213,993
Adjustments to reconcile net income to net cash provided by operating activities	(834,838)	93,541
Net Cash Provided By Operating Activities	249,158	307,534
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	232,376	234,442
Proceeds from maturities, calls and prepayments of fixed maturities	306,095	374,719
Cost of fixed maturities and equity securities purchased	(487,671)	(1,185,375)
Net change in short-term investments	(293,832)	220,428
Cost of equity method investments	(215,442)	(2,645)
Additions to property and equipment	(49,232)	(52,388)
Proceeds from disposals of fixed assets	13,781	291
Acquisitions, net of cash acquired	(25,230)	(7,804)
Other	(2,491)	(27,307)
Net Cash Used By Investing Activities	(521,646)	(445,639)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	734,729	109,113
Repayment of senior long-term debt and other debt	(113,719)	(180,158)
Repurchases of common stock	(69,266)	(24,257)
Payment of contingent consideration	(14,113)	(727)
Purchase of noncontrolling interests	(9,754)	(7,058)
Distributions to noncontrolling interests	(4,901)	(5,815)
Other	(2,820)	(2,561)
Net Cash Provided (Used) By Financing Activities	520,156	(111,463)
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	(2,634)	(6,882)
Increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	245,034	(256,450)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	2,396,432	2,500,846
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD	$ 2,641,466	$ 2,244,396