Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income	$ 1,287,949	$ 623,021
Adjustments to reconcile net income to net cash provided by operating activities	(575,991)	140,155
Net Cash Provided By Operating Activities	711,958	763,176
INVESTING ACTIVITIES
Proceeds from sales of fixed maturities and equity securities	326,304	361,768
Proceeds from maturities, calls and prepayments of fixed maturities	446,625	459,517
Cost of fixed maturities and equity securities purchased	(657,563)	(1,409,263)
Net change in short-term investments	(451,408)	257,288
Cost of equity method investments	(216,806)	(3,647)
Additions to property and equipment	(95,457)	(78,886)
Proceeds from disposals of fixed assets	15,949	1,528
Acquisitions, net of cash acquired	(25,627)	(11,314)
Other	825	(30,206)
Net Cash Used By Investing Activities	(657,158)	(453,215)
FINANCING ACTIVITIES
Additions to senior long-term debt and other debt	1,578,823	145,813
Repayment of senior long-term debt and other debt	(680,516)	(246,049)
Premiums and fees related to early extinguishment of debt	(10,086)	0
Repurchases of common stock	(81,998)	(30,829)
Payment of contingent consideration	(14,113)	(15,914)
Purchase of noncontrolling interests	(9,754)	(13,523)
Distributions to noncontrolling interests	(7,147)	(7,964)
Other	(4,565)	(3,303)
Net Cash Provided (Used) By Financing Activities	770,644	(171,769)
Effect of foreign currency rate changes on cash, cash equivalents, restricted cash and restricted cash equivalents	(22,107)	(12,096)
Increase in cash, cash equivalents, restricted cash and restricted cash equivalents	803,337	126,096
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	$ 3,199,769	$ 2,626,942