Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 109,804	$ 76,172
Adjustments to reconcile net income to cash provided by operating activities:
Provision for policy losses and other claims	97,712	100,580
Depreciation and amortization	32,934	29,747
Amortization of premiums and accretion of discounts on debt securities, net	5,464	6,743
Net realized investment (gains) losses	(32,682)	5,654
Share-based compensation	19,597	19,509
Equity in earnings of equity method investments, net	180	296
Dividends from equity method investments	545	805
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(99,992)	(104,614)
Net change in income tax accounts	29,186	12,320
Decrease in accounts and accrued income receivable	2,543	5,493
Decrease in accounts payable and accrued liabilities	(118,318)	(95,978)
Decrease in deferred revenue	(13,447)	(14,378)
Other, net	945	818
Cash provided by operating activities	34,471	43,167
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(225)	(24,484)
Net (increase) decrease in deposits with banks	(8,824)	2,292
Purchases of debt and equity securities	(727,001)	(586,150)
Proceeds from sales of debt and equity securities	461,447	213,432
Proceeds from maturities of debt securities	136,670	126,920
Net (increase) decrease in other investments	(73,964)	640
Advances under secured financing agreements	(985,478)	0
Collections of secured financings receivable	934,149	0
Capital expenditures	(27,386)	(22,344)
Proceeds from sales of property and equipment	12	1,015
Cash used for investing activities	(290,600)	(288,679)
Cash flows from financing activities:
Net change in deposits	135,720	91,140
Borrowings under secured financing agreements	985,878	0
Repayments of secured financings payable	(934,544)	0
Repayments of notes and contracts payable	(1,411)	(1,422)
Net activity related to noncontrolling interests	(1,065)	(895)
Net payments in connection with share-based compensation	(11,480)	(12,606)
Purchase of Company shares	(2,066)	0
Payments of cash dividends	(47,021)	(42,330)
Cash provided by financing activities	124,011	33,887
Effect of exchange rate changes on cash	2,041	1,017
Net decrease in cash and cash equivalents	(130,077)	(210,608)
Cash and cash equivalents—Beginning of period	1,467,129	1,387,226
Cash and cash equivalents—End of period	1,337,052	1,176,618
Supplemental information:
Interest	10,353	8,318
Premium taxes	24,353	28,877
Income taxes, less refunds of $548 and $18	$ 2,559	$ 4,187