Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 382,724	$ 201,150
Adjustments to reconcile net income to cash provided by operating activities:
Provision for policy losses and other claims	336,395	333,695
Depreciation and amortization	92,534	96,292
Amortization of premiums and accretion of discounts on debt securities, net	20,521	25,013
Net realized investment gains	(10,975)	(10,763)
Share-based compensation	34,376	31,196
Equity in earnings of affiliates, net	(2,255)	(4,550)
Dividends from equity method investments	3,419	9,593
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(333,970)	(351,397)
Net change in income tax accounts	12,301	34,462
Increase in accounts and accrued income receivable	(51,150)	(11,907)
(Decrease) increase in accounts payable and accrued liabilities	(11,806)	95,383
Increase in deferred revenue	14,678	20,313
Other, net	(1,931)	(12,953)
Cash provided by operating activities	484,861	455,527
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(73,757)	(82,993)
Net decrease in deposits with banks	2,462	1,171
Purchases of debt and equity securities	(1,924,260)	(1,276,401)
Proceeds from sales of debt and equity securities	660,548	599,365
Proceeds from maturities of debt securities	429,287	457,334
Net change in other investments	(6,612)	2,555
Advances under secured financing agreements	(1,537,657)	0
Collections of secured financings receivable	1,520,911	0
Capital expenditures	(87,319)	(103,064)
Proceeds from sales of property and equipment	1,670	9,882
Cash used for investing activities	(1,014,727)	(392,151)
Cash flows from financing activities:
Net change in deposits	1,478,069	185,948
Borrowings under secured financing agreements	1,537,593	0
Repayments of secured financings payable	(1,520,855)	0
Repayments of notes and contracts payable	(4,111)	(4,128)
Net activity related to noncontrolling interests	(945)	(964)
Net (payments) proceeds in connection with share-based compensation plans	(6,673)	1,195
Payments of cash dividends	(131,629)	(117,174)
Cash provided by financing activities	1,351,449	64,877
Effect of exchange rate changes on cash	(3,490)	7,524
Net increase in cash and cash equivalents	818,093	135,777
Cash and cash equivalents—Beginning of period	1,387,226	1,006,138
Cash and cash equivalents—End of period	2,205,319	1,141,915
Supplemental information:
Interest	28,030	24,619
Premium taxes	56,396	55,233
Income taxes, less refunds of $1,047 and $52,828	$ 95,041	$ 50,264