Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 52,672	$ 37,796
Adjustments to reconcile net income to cash used for operating activities:
Provision for policy losses and other claims	107,098	101,554
Depreciation and amortization	22,420	20,854
Amortization of premiums and accretion of discounts on debt securities, net	6,477	6,676
Excess tax benefits from share-based compensation	(2,607)	(5,588)
Net realized investment (gains) losses	(5,106)	953
Share-based compensation	15,858	10,858
Equity in earnings of affiliates, net	(894)	(1,130)
Dividends from equity method investments	2,723	2,433
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(114,009)	(135,692)
Net change in income tax accounts	(9,622)	(7,052)
Increase in accounts and accrued income receivable	(1,374)	(600)
Decrease in accounts payable and accrued liabilities	(123,039)	(98,704)
Decrease in deferred revenue	(11,204)	(13,033)
Other, net	4,235	14,358
Cash used for operating activities	(56,372)	(66,317)
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(700)	(25,860)
Net decrease in deposits with banks	353	3,354
Purchases of debt and equity securities	(282,980)	(806,547)
Proceeds from sales of debt and equity securities	74,317	255,643
Proceeds from maturities of debt securities	206,918	104,070
Net change in other investments	(604)	1,784
Capital expenditures	(29,858)	(31,881)
Proceeds from sales of property and equipment	8,795	4,197
Cash used for investing activities	(23,759)	(495,240)
Cash flows from financing activities:
Net change in deposits	59,917	279,636
Repayment of debt	(1,028)	(1,123)
Net activity related to noncontrolling interests	(744)	(655)
Excess tax benefits from share-based compensation	2,607	5,588
Net payments in connection with share-based compensation plans	(4,751)	(2,093)
Purchase of Company shares	(454)
Cash dividends	(28,410)	(26,981)
Cash provided by financing activities	27,137	254,372
Effect of exchange rate changes on cash	1,556	(4,498)
Net decrease in cash and cash equivalents	(51,438)	(311,683)
Cash and cash equivalents—Beginning of period	1,027,321	1,190,080
Cash and cash equivalents—End of period	975,883	878,397
Supplemental information:
Interest	6,507	6,493
Premium taxes	27,855	23,670
Income taxes, less refunds of $361 and $579	$ 32,540	$ 28,260