Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Direct premiums	$ 616,587	$ 587,882	$ 1,825,906	$ 1,753,589
Ceded premiums	(399,676)	(393,987)	(1,201,692)	(1,198,382)
Net premiums	216,911	193,895	624,214	555,207
Commissions and fees	134,282	132,368	400,005	404,353
Investment income net of investment expenses	24,356	22,487	74,742	67,918
Interest expense on surplus note	(4,957)	(3,772)	(13,716)	(8,954)
Net investment income	19,399	18,715	61,026	58,964
Realized investment gains (losses), including other-than- temporary impairment losses	(35)	(259)	2,623	1,623
Other, net	13,069	10,990	37,353	30,605
Total revenues	383,626	355,709	1,125,221	1,050,752
Benefits and expenses:
Benefits and claims	93,022	88,599	272,983	253,621
Amortization of deferred policy acquisition costs	45,428	40,797	127,277	113,392
Sales commissions	66,700	67,402	203,489	207,358
Insurance expenses	32,837	30,266	98,873	93,365
Insurance commissions	4,709	4,619	13,328	11,953
Interest expense	7,184	8,718	21,534	26,036
Other operating expenses	45,309	40,355	137,206	126,439
Total benefits and expenses	295,189	280,756	874,690	832,164
Income before income taxes	88,437	74,953	250,531	218,588
Income taxes	30,400	25,603	87,991	76,664
Net income	$ 58,037	$ 49,350	$ 162,540	$ 141,924
Earnings per share:
Basic earnings per share	$ 1.22	$ 0.98	$ 3.38	$ 2.73
Diluted earnings per share	$ 1.22	$ 0.98	$ 3.37	$ 2.73
Weighted-average shares used in computing earnings per share:
Basic	47,008	50,082	47,736	51,494
Diluted	47,051	50,104	47,775	51,526
Supplemental disclosures:
Total impairment losses	$ (478)	$ (1,564)	$ (3,308)	$ (2,433)
Net impairment losses recognized in earnings	(478)	(1,564)	(3,308)	(2,433)
Other net realized investment gains (losses)	443	1,305	5,931	4,056
Realized investment gains (losses), including other-than- temporary impairment losses	$ (35)	$ (259)	$ 2,623	$ 1,623
Dividends declared per share	$ 0.18	$ 0.16	$ 0.52	$ 0.48