Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 262,515	$ 207,135
Adjustments to reconcile net income to cash provided by operating activities:
Provision for policy losses and other claims	366,473	363,550
Depreciation and amortization	70,905	63,389
Amortization of premiums and accretion of discounts on debt securities, net	20,267	21,702
Excess tax benefits from share-based compensation	(3,197)	(8,496)
Net realized investment (gains) losses	(22,692)	215
Share-based compensation	28,096	20,261
Equity in earnings of affiliates, net	(5,771)	(7,710)
Dividends from equity method investments	7,953	7,559
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(351,349)	(364,255)
Net change in income tax accounts	20,765	56,784
Increase in accounts and accrued income receivable	(43,454)	(32,194)
Decrease in accounts payable and accrued liabilities	(99,777)	(7,074)
Increase in deferred revenue	23,342	12,049
Other, net	(21,857)	19,282
Cash provided by operating activities	252,219	352,197
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(73,173)	(26,662)
Net decrease in deposits with banks	608	2,471
Purchases of debt and equity securities	(1,490,824)	(1,726,939)
Proceeds from sales of debt and equity securities	494,717	443,276
Proceeds from maturities of debt securities	744,411	531,440
Net change in other investments	2,798	470
Capital expenditures	(103,735)	(91,964)
Proceeds from sales of property and equipment	9,218	17,057
Cash used for investing activities	(415,980)	(850,851)
Cash flows from financing activities:
Net change in deposits	519,113	288,495
Net proceeds from issuance of debt	160,000
Repayment of debt	(3,745)	(4,087)
Net activity related to noncontrolling interests	(1,004)	(705)
Excess tax benefits from share-based compensation	3,197	8,496
Net payments in connection with share-based compensation plans	(754)	(1,534)
Purchase of Company shares	(454)
Cash dividends	(94,202)	(81,283)
Cash provided by financing activities	582,151	209,382
Effect of exchange rate changes on cash	(2,399)	(6,378)
Net increase (decrease) in cash and cash equivalents	415,991	(295,650)
Cash and cash equivalents—Beginning of period	1,027,321	1,190,080
Cash and cash equivalents—End of period	1,443,312	894,430
Supplemental information:
Interest	21,097	21,166
Premium taxes	54,151	45,683
Income taxes, less refunds of $2,731 and $711	$ 112,401	$ 52,069