Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Net premiums earned	$ 172,339	$ 168,604	$ 341,342	$ 329,736
Net investment income	13,431	13,982	26,926	27,564
Net realized investment gains	4,802	10,431	18,088	16,932
Consolidated revenue	190,572	193,017	386,356	374,232
Losses and settlement expenses	64,549	73,345	145,410	144,361
Policy acquisition costs	59,487	55,156	118,460	110,207
Insurance operating expenses	13,467	13,534	24,998	26,067
Interest expense on debt	1,857	1,874	3,713	3,725
General corporate expenses	2,748	2,549	4,992	4,747
Total expenses	142,108	146,458	297,573	289,107
Equity in earnings of unconsolidated investees	6,186	5,864	10,380	9,289
Earnings before income taxes	54,650	52,423	99,163	94,414
Income tax expense	17,465	16,698	31,380	29,720
Net earnings	37,185	35,725	67,783	64,694
Other comprehensive earnings (loss), net of tax	(24,932)	19,934	(32,527)	37,671
Comprehensive earnings	$ 12,253	$ 55,659	$ 35,256	$ 102,365
Basic:
Net earnings per share (in dollars per share)	$ 0.86	$ 0.83	$ 1.57	$ 1.50
Comprehensive earnings per share (in dollars per share)	0.28	1.29	0.82	2.38
Diluted:
Net earnings per share (in dollars per share)	0.84	0.82	1.54	1.48
Comprehensive earnings per share (in dollars per share)	$ 0.28	$ 1.27	$ 0.80	$ 2.34
Weighted average number of common shares outstanding
Basic (in shares)	43,210	43,001	43,176	42,993
Diluted (in shares)	44,019	43,688	44,008	43,669
Cash dividends paid per common share (in dollars per share)	$ 0.19	$ 0.18	$ 0.37	$ 0.35