Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net premiums earned	$ 207,541	$ 196,522	$ 412,230	$ 386,549
Net investment income	16,998	14,577	33,563	28,809
Net realized gains	4,764	20,849	13,832	29,309
Other-than-temporary-impairment (OTTI) losses on investments				(56)
Net unrealized gains (losses) on equity securities	8,810	(12,611)	42,308	(39,383)
Consolidated revenue	238,113	219,337	501,933	405,228
Losses and settlement expenses	103,919	101,653	198,216	194,074
Policy acquisition costs	71,742	66,325	143,034	133,059
Insurance operating expenses	16,948	14,398	33,615	27,783
Interest expense on debt	1,861	1,858	3,722	3,714
General corporate expenses	3,283	2,641	6,559	4,924
Total expenses	197,753	186,875	385,146	363,554
Equity in earnings of unconsolidated investees	8,468	7,100	13,782	12,266
Earnings before income taxes	48,828	39,562	130,569	53,940
Income tax expense:
Income tax expense	8,361	6,311	24,629	8,473
Net earnings	40,467	33,251	105,940	45,467
Other comprehensive earnings (loss), net of tax	27,864	(7,675)	57,165	(34,073)
Comprehensive earnings	$ 68,331	$ 25,576	$ 163,105	$ 11,394
Basic:
Net earnings per share (in dollars per share)	$ 0.91	$ 0.75	$ 2.37	$ 1.03
Comprehensive earnings per share (in dollars per share)	1.53	0.58	3.66	0.26
Diluted:
Net earnings per share (in dollars per share)	0.89	0.74	2.35	1.01
Comprehensive earnings per share (in dollars per share)	$ 1.51	$ 0.57	$ 3.62	$ 0.25
Weighted average number of common shares outstanding
Basic (in shares)	44,704	44,310	44,620	44,266
Diluted (in shares)	45,219	44,742	45,056	44,853
Cash dividends paid per common share	$ 0.23	$ 0.22	$ 0.45	$ 0.43