Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Net premiums earned	$ 200,815	$ 182,025	$ 587,364	$ 549,641
Net investment income	16,314	14,187	45,123	40,430
Net realized gains	18,808	35	48,117	1,390
Other-than-temporary-impairment (OTTI) losses on investments	(161)		(217)	(2,090)
Net unrealized gains (losses) on equity securities	4,848		(34,535)
Consolidated revenue	240,624	196,247	645,852	589,371
Losses and settlement expenses	110,231	123,190	304,305	306,927
Policy acquisition costs	68,414	62,066	201,473	186,264
Insurance operating expenses	14,408	11,701	42,191	38,582
Interest expense on debt	1,862	1,856	5,576	5,569
General corporate expenses	2,947	1,956	7,871	7,816
Total expenses	197,862	200,769	561,416	545,158
Equity in earnings of unconsolidated investees	3,587	3,660	15,853	15,404
Earnings (loss) before income taxes	46,349	(862)	100,289	59,617
Income tax expense:
Income tax expense (benefit)	6,977	(2,596)	15,450	11,847
Net earnings	39,372	1,734	84,839	47,770
Other comprehensive earnings (loss), net of tax	(7,696)	8,444	(41,769)	30,812
Comprehensive earnings	$ 31,676	$ 10,178	$ 43,070	$ 78,582
Basic:
Net earnings per share (in dollars per share)	$ 0.89	$ 0.04	$ 1.91	$ 1.09
Comprehensive earnings per share (in dollars per share)	0.71	0.23	0.97	1.79
Diluted:
Net earnings per share (in dollars per share)	0.88	0.04	1.90	1.07
Comprehensive earnings per share (in dollars per share)	$ 0.70	$ 0.23	$ 0.96	$ 1.77
Weighted average number of common shares outstanding
Basic (in shares)	44,400	44,058	44,311	44,008
Diluted (in shares)	44,940	44,515	44,760	44,517
Cash dividends paid per common share	$ 0.22	$ 0.21	$ 0.65	$ 0.62