Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 58,069	$ 52,672
Adjustments to reconcile net income to cash provided by (used for) operating activities:
Provision for policy losses and other claims	102,388	107,098
Depreciation and amortization	30,147	22,420
Amortization of premiums and accretion of discounts on debt securities, net	9,427	6,477
Excess tax benefits from share-based compensation	0	(2,607)
Net realized investment losses (gains)	97	(5,106)
Share-based compensation	17,032	15,858
Equity in earnings of affiliates, net	(1,644)	(894)
Dividends from equity method investments	3,612	2,723
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(114,014)	(114,009)
Net change in income tax accounts	64,170	(9,622)
Decrease (increase) in accounts and accrued income receivable	714	(1,374)
Decrease in accounts payable and accrued liabilities	(137,320)	(123,039)
Decrease in deferred revenue	(11,812)	(11,204)
Other, net	(14,806)	4,235
Cash provided by (used for) operating activities	6,060	(56,372)
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	250	(700)
Net (increase) decrease in deposits with banks	(164)	353
Purchases of debt and equity securities	(341,974)	(282,980)
Proceeds from sales of debt and equity securities	201,923	74,317
Proceeds from maturities of debt securities	145,316	206,918
Net change in other investments	840	(604)
Capital expenditures	(29,903)	(29,858)
Proceeds from sales of property and equipment	8	8,795
Cash used for investing activities	(23,704)	(23,759)
Cash flows from financing activities:
Net change in deposits	103,334	59,917
Repayment of debt	(1,323)	(1,028)
Net activity related to noncontrolling interests	(853)	(744)
Excess tax benefits from share-based compensation	0	2,607
Net payments in connection with share-based compensation plans	(5,947)	(4,751)
Purchase of Company shares	0	(454)
Cash dividends	(37,495)	(28,410)
Cash provided by financing activities	57,716	27,137
Effect of exchange rate changes on cash	1,257	1,556
Net increase (decrease) in cash and cash equivalents	41,329	(51,438)
Cash and cash equivalents—Beginning of period	1,006,138	1,027,321
Cash and cash equivalents—End of period	1,047,467	975,883
Supplemental information:
Interest	7,594	6,507
Premium taxes	28,739	27,855
Income taxes	4,211	32,901
Income tax refunds	$ (42,575)	$ (361)