Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Net earned premiums	$ 774,328	$ 771,078	$ 788,777
Net investment income	44,135	41,045	46,665
Earnings from partnership investments	19,829	6,901	1,937
Net realized gains on investments	14,885	957	2,976
Change in unrealized gains on equity securities	16,130	10,449	21,454
Net impairment losses on investments (a)			(889)
Credit loss benefit (expense)	363	(1,054)
Finance and other service income	15,241	16,872	16,833
Total revenue	884,911	846,248	877,753
Expenses
Losses and loss adjustment expenses	461,727	404,556	509,846
Underwriting, operating and related expenses	258,392	266,482	244,136
Interest expense	522	440	90
Total expenses	720,641	671,478	754,072
Income before income taxes	164,270	174,770	123,681
Income tax expense	33,560	36,559	24,080
Net income	$ 130,710	$ 138,211	$ 99,601
Earnings per weighted average common share:
Basic (in dollars per share)	$ 8.85	$ 9.25	$ 6.52
Diluted (in dollars per share)	8.80	9.18	6.46
Cash dividends paid per common share (in dollars per share)	$ 3.60	$ 3.60	$ 3.40
Number of shares used in computing earnings per share:
Basic (in shares)	14,828,736	15,002,755	15,201,132
Diluted (in shares)	14,925,726	15,119,027	15,337,807