Condensed Consolidated Statements of Earnings and Comprehensive Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Net premiums earned	$ 177,747	$ 163,702	$ 507,483	$ 462,406
Net investment income	14,200	13,598	41,764	39,331
Net realized investment gains	5,708	10,999	22,640	18,425
Consolidated revenue	197,655	188,299	571,887	520,162
Losses and settlement expenses	76,019	64,246	220,380	191,301
Policy acquisition costs	58,180	54,176	168,387	156,014
Insurance operating expenses	13,120	13,462	39,187	37,916
Interest expense on debt	1,857	1,513	5,582	4,538
General corporate expenses	2,800	2,157	7,547	6,235
Total expenses	151,976	135,554	441,083	396,004
Equity in earnings of unconsolidated investee	2,915	2,564	12,204	10,696
Earnings before income taxes	48,594	55,309	143,008	134,854
Income tax expense	15,340	17,662	45,060	42,458
Net earnings	33,254	37,647	97,948	92,396
Other comprehensive earnings (loss)	(12,353)	(1,946)	25,318	(17,874)
Comprehensive earnings	$ 20,901	$ 35,701	$ 123,266	$ 74,522
Basic:
Basic net earnings per share (in dollars per share)	$ 0.77	$ 0.88	$ 2.28	$ 2.17
Basic comprehensive earnings per share (in dollars per share)	$ 0.49	$ 0.83	$ 2.87	$ 1.75
Diluted:
Diluted net earnings per share (in dollars per share)	$ 0.76	$ 0.86	$ 2.24	$ 2.13
Diluted comprehensive earnings per share (in dollars per share)	$ 0.48	$ 0.82	$ 2.82	$ 1.72
Weighted average number of common shares outstanding
Basic (in shares)	43,026	42,843	43,004	42,673
Diluted (in shares)	43,712	43,546	43,692	43,330
Cash dividends paid per common share (in dollars per share)	$ 0.18	$ 0.17	$ 0.53	$ 0.50