Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Net premiums earned	$ 183,285	$ 176,918
Net investment income	13,005	13,370
Net realized gains	2,714	11,400
Other-than-temporary-impairment (OTTI) losses on investments	(2,090)
Consolidated revenue	196,914	201,688
Losses and settlement expenses	93,390	81,171
Policy acquisition costs	63,503	62,243
Insurance operating expenses	13,335	12,200
Interest expense on debt	1,856	1,857
General corporate expenses	3,325	2,375
Total expenses	175,409	159,846
Equity in earnings of unconsolidated investees	4,938	3,751
Earnings before income taxes	26,443	45,593
Income tax expense:
Total tax expense	6,615	14,200
Net earnings	19,828	31,393
Other comprehensive earnings, net of tax	11,769	21,763
Comprehensive earnings	$ 31,597	$ 53,156
Basic:
Net earnings per share (in dollars per share)	$ 0.45	$ 0.72
Comprehensive earnings per share (in dollars per share)	0.72	1.22
Diluted:
Net earnings per share (in dollars per share)	0.45	0.71
Comprehensive earnings per share (in dollars per share)	$ 0.71	$ 1.20
Weighted average number of common shares outstanding
Basic (in shares)	43,961	43,597
Diluted (in shares)	44,502	44,361
Cash dividends paid per common share	$ 0.20	$ 0.19