Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 201,150	$ 262,515
Adjustments to reconcile net income to cash provided by operating activities:
Provision for policy losses and other claims	333,695	366,473
Depreciation and amortization	96,292	70,905
Amortization of premiums and accretion of discounts on debt securities, net	25,013	20,267
Excess tax benefits from share-based compensation	0	(3,197)
Net realized investment gains	(10,763)	(22,692)
Share-based compensation	31,196	28,096
Equity in earnings of affiliates, net	(4,550)	(5,771)
Dividends from equity method investments	9,593	7,953
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(351,397)	(351,349)
Net change in income tax accounts	34,462	20,765
Increase in accounts and accrued income receivable	(11,907)	(43,454)
Increase (decrease) in accounts payable and accrued liabilities	95,383	(99,777)
Increase in deferred revenue	20,313	23,342
Other, net	(12,953)	(21,857)
Cash provided by operating activities	455,527	252,219
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(82,993)	(73,173)
Net decrease in deposits with banks	1,171	608
Purchases of debt and equity securities	(1,276,401)	(1,490,824)
Proceeds from sales of debt and equity securities	599,365	494,717
Proceeds from maturities of debt securities	457,334	744,411
Net change in other investments	2,555	2,798
Capital expenditures	(103,064)	(103,735)
Proceeds from sales of property and equipment	9,882	9,218
Cash used for investing activities	(392,151)	(415,980)
Cash flows from financing activities:
Net change in deposits	185,948	519,113
Net proceeds from issuance of debt	0	160,000
Repayment of debt	(4,128)	(3,745)
Net activity related to noncontrolling interests	(964)	(1,004)
Excess tax benefits from share-based compensation	0	3,197
Net proceeds (payments) in connection with share-based compensation plans	1,195	(754)
Purchase of Company shares	0	(454)
Cash dividends	(117,174)	(94,202)
Cash provided by financing activities	64,877	582,151
Effect of exchange rate changes on cash	7,524	(2,399)
Net increase in cash and cash equivalents	135,777	415,991
Cash and cash equivalents—Beginning of period	1,006,138	1,027,321
Cash and cash equivalents—End of period	1,141,915	1,443,312
Supplemental information:
Interest	24,619	21,097
Premium taxes	55,233	54,151
Income taxes, less refunds of $52,828 and $2,731	$ 50,264	$ 112,401