Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Net premiums earned	$ 791,366	$ 737,937	$ 728,608
Net investment income	62,085	54,876	53,075
Net realized gains	63,624	6,970	34,740
Other-than-temporary-impairment (OTTI) losses on investments	(217)	(2,559)	(95)
Net unrealized losses on equity securities	(98,735)
Consolidated revenue	818,123	797,224	816,328
Losses and settlement expenses	428,193	401,584	349,778
Policy acquisition costs	267,738	252,515	249,612
Insurance operating expenses	53,803	56,994	53,093
Interest expense on debt	7,437	7,426	7,426
General corporate expenses	9,427	11,340	10,170
Total expenses	766,598	729,859	670,079
Equity in earnings of unconsolidated investees	16,056	17,224	10,833
Earnings before income taxes	67,581	84,589	157,082
Income tax expense:
Current	23,917	9,302	41,034
Deferred	(20,515)	(29,741)	1,128
Income tax expense (benefit)	3,402	(20,439)	42,162
Net earnings	64,179	105,028	114,920
Other comprehensive earnings (loss), net of tax	(33,997)	35,309	(1,164)
Comprehensive earnings	$ 30,182	$ 140,337	$ 113,756
Basic:
Net earnings per share (in dollars per share)	$ 1.45	$ 2.39	$ 2.63
Comprehensive earnings per share (in dollars per share)	0.68	3.19	2.60
Diluted:
Net earnings per share (in dollars per share)	1.43	2.36	2.59
Comprehensive earnings per share (in dollars per share)	$ 0.67	$ 3.15	$ 2.56
Weighted average number of common shares outstanding
Basic (in shares)	44,358	44,033	43,772
Diluted (in shares)	44,835	44,500	44,432
Cash dividends paid per common share	$ 1.87	$ 2.58	$ 2.79