Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Net earned premiums	$ 195,524	$ 190,712	$ 578,059	$ 563,759
Net investment income	9,503	8,967	28,313	28,235
Earnings from partnership investments	351	802	1,233	3,089
Net realized gains on investments	2,717	4,891	4,826	4,928
Net impairment losses on investments (a)	(256)		(256)	(429)
Finance and other service income	4,690	4,713	13,373	13,282
Total revenue	212,529	210,085	625,548	612,864
Expenses
Losses and loss adjustment expenses	123,792	124,961	369,271	366,084
Underwriting, operating and related expenses	62,994	58,406	183,643	171,876
Interest expense	22	22	67	67
Total expenses	186,808	183,389	552,981	538,027
Income before income taxes	25,721	26,696	72,567	74,837
Income tax expense	7,767	8,099	21,489	22,205
Net income	$ 17,954	$ 18,597	$ 51,078	$ 52,632
Earnings per weighted average common share:
Basic (in dollars per share)	$ 1.19	$ 1.24	$ 3.38	$ 3.50
Diluted (in dollars per share)	1.18	1.23	3.36	3.48
Cash dividends paid per common share (in dollars per share)	$ 0.80	$ 0.70	$ 2.20	$ 2.10
Number of shares used in computing earnings per share:
Basic (in shares)	15,021,189	14,960,516	15,007,221	14,941,732
Diluted (in shares)	15,161,962	15,076,635	15,124,044	15,018,124