Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Net earned premiums	$ 192,824	$ 187,393	$ 382,535	$ 373,047
Net investment income	9,715	9,641	18,810	19,268
Earnings from partnership investments	769	1,409	882	2,287
Net realized gains on investments	567	360	2,109	37
Net impairment losses on investments (a)		(137)		(429)
Finance and other service income	4,374	4,284	8,683	8,569
Total revenue	208,249	202,950	413,019	402,779
Expenses
Losses and loss adjustment expenses	117,049	115,144	245,479	241,123
Underwriting, operating and related expenses	60,979	57,513	120,649	113,470
Interest expense	23	23	45	45
Total expenses	178,051	172,680	366,173	354,638
Income before income taxes	30,198	30,270	46,846	48,141
Income tax expense	9,093	8,905	13,722	14,106
Net income	$ 21,105	$ 21,365	$ 33,124	$ 34,035
Earnings per weighted average common share:
Basic (in dollars per share)	$ 1.40	$ 1.42	$ 2.19	$ 2.26
Diluted (in dollars per share)	1.39	1.41	2.18	2.25
Cash dividends paid per common share (in dollars per share)	$ 0.70	$ 0.70	$ 1.40	$ 1.40
Number of shares used in computing earnings per share:
Basic (in shares)	15,020,028	14,960,516	15,000,127	14,932,237
Diluted (in shares)	15,114,284	15,041,077	15,105,554	14,988,546