Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Direct premiums and escrow fees	$ 661,582	$ 641,080	$ 1,205,460	$ 1,168,089
Agent premiums	559,004	554,028	1,086,718	1,128,610
Information and other	208,752	201,851	397,410	384,360
Net investment income	56,334	39,609	99,126	72,649
Net realized investment gains (losses)	5,485	17,861	(169)	17,764
Total revenues	1,491,157	1,454,429	2,788,545	2,771,472
Expenses
Personnel costs	448,974	436,441	862,616	843,578
Premiums retained by agents	439,550	435,771	856,187	889,697
Other operating expenses	228,935	230,791	447,415	446,193
Provision for policy losses and other claims	113,619	110,958	214,199	213,346
Depreciation and amortization	31,058	30,145	60,805	60,292
Premium taxes	17,049	17,179	33,063	32,627
Interest	10,004	8,990	19,227	17,705
Total expenses	1,289,189	1,270,275	2,493,512	2,503,438
Income before income taxes	201,968	184,154	295,033	268,034
Income taxes	46,877	62,259	63,770	88,070
Net income	155,091	121,895	231,263	179,964
Less: Net loss attributable to noncontrolling interests	(49)	(362)	(104)	(575)
Net income attributable to the Company	$ 155,140	$ 122,257	$ 231,367	$ 180,539
Net income per share attributable to the Company's stockholders (Note 9):
Basic	$ 1.38	$ 1.10	$ 2.06	$ 1.62
Diluted	1.37	1.09	2.05	1.61
Cash dividends declared per share	$ 0.38	$ 0.34	$ 0.76	$ 0.68
Weighted-average common shares outstanding (Note 9):
Basic	112,556	111,549	112,406	111,374
Diluted	113,117	112,199	113,093	112,026