Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 485,242	$ 382,724
Adjustments to reconcile net income to cash provided by operating activities:
Provision for policy losses and other claims	331,525	336,395
Depreciation and amortization	97,537	92,534
Amortization of premiums and accretion of discounts on debt securities, net	18,646	20,521
Net realized investment gains	(42,564)	(10,975)
Share-based compensation	34,911	34,376
Equity in earnings of equity method investments, net	(1,802)	(2,255)
Dividends from equity method investments	4,077	3,419
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(305,174)	(333,970)
Net change in income tax accounts	17,523	12,301
Increase in accounts and accrued income receivable	(52,757)	(51,150)
Increase (decrease) in accounts payable and accrued liabilities	10,686	(11,806)
Increase in deferred revenue	19,484	14,678
Other, net	(5,653)	(1,931)
Cash provided by operating activities	611,681	484,861
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(19,674)	(73,757)
Net (increase) decrease in deposits with banks	(3,749)	2,462
Purchases of debt and equity securities	(1,611,934)	(1,924,260)
Proceeds from sales of debt and equity securities	979,019	660,548
Proceeds from maturities of debt securities	666,749	429,287
Net increase in other investments	(81,707)	(6,612)
Advances under secured financing agreements	(5,311,828)	(1,537,657)
Collections of secured financings receivable	5,036,122	1,520,911
Capital expenditures	(78,158)	(87,319)
Proceeds from sales of property and equipment	105	1,670
Cash used for investing activities	(425,055)	(1,014,727)
Cash flows from financing activities:
Net change in deposits	54,545	1,478,069
Borrowings under secured financing agreements	5,195,063	1,537,593
Repayments of secured financings payable	(5,037,893)	(1,520,855)
Borrowings under unsecured credit agreement	160,000	0
Repayments of notes and contracts payable	(164,280)	(4,111)
Net activity related to noncontrolling interests	(1,112)	(945)
Net payments in connection with share-based compensation	(4,859)	(6,673)
Purchase of Company shares	(2,066)	0
Payments of cash dividends	(141,244)	(131,629)
Cash provided by financing activities	58,154	1,351,449
Effect of exchange rate changes on cash	(910)	(3,490)
Net increase in cash and cash equivalents	243,870	818,093
Cash and cash equivalents—Beginning of period	1,467,129	1,387,226
Cash and cash equivalents—End of period	1,710,999	2,205,319
Supplemental information:
Interest	34,053	28,030
Premium taxes	55,229	56,396
Income taxes, less refunds of $930 and $1,047	$ 113,723	$ 95,041