Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Net premiums earned	$ 1,037,451	$ 997,492	$ 936,131
Investment income, net of investment expenses	52,894	51,190	55,284
Net realized investment gains (losses) (includes reclassifications for net unrealized gains on available-for-sale securities of ($784) in 2018; $6,390 in 2017; and $4,520 in 2016 previously included in accumulated other comprehensive income)	(20,179)	4,055	4,947
Total revenues	1,070,166	1,052,737	996,362
Benefits, losses and expenses
Losses and loss settlement expenses	731,611	725,713	652,433
Amortization of deferred policy acquisition costs	206,232	207,746	202,892
Other underwriting expenses (includes reclassifications for employee benefit costs of $6,642 in 2018; $5,408 in 2017; and $5,486 in 2016 previously included in accumulated other comprehensive income)	141,473	103,628	83,540
Total benefits, losses and expenses	1,079,316	1,037,087	938,865
Income (loss) from continuing operations before income taxes	(9,150)	15,650	57,497
Federal income tax expense (benefit) (includes reclassifications of $1,559 in 2018; $(344) in 2017; and $338 in 2016 previously included in accumulated other comprehensive income)	(11,405)	(29,220)	8,379
Net income from continuing operations	2,255	44,870	49,118
Income (loss) from discontinued operations, net of taxes	(1,912)	6,153	786
Gain on sale of discontinued operations, net of taxes	27,307	0	0
Net income	27,650	51,023	49,904
Other comprehensive income (loss)
Change in net unrealized appreciation on investments	(50,985)	72,251	13,017
Change in liability for underfunded employee benefit plans	25,513	(26,122)	30,045
Other comprehensive income (loss), before tax and reclassification adjustments	(25,472)	46,129	43,062
Income tax effect	5,349	(17,540)	(15,072)
Other comprehensive income (loss), after tax, before reclassification adjustments	(20,123)	28,589	27,990
Reclassification adjustment for net realized (gains) losses included in income	784	(6,390)	(4,520)
Reclassification adjustment for employee benefit costs included in expense	6,642	5,408	5,486
Total reclassification adjustments, before tax	7,426	(982)	966
Income tax effect	(1,559)	344	(338)
Total reclassification adjustments, after tax	5,867	(638)	628
Comprehensive income	$ 13,394	$ 78,974	$ 78,522
Weighted average common shares outstanding (in shares)	25,006,211	25,103,720	25,335,706
Earnings per common share from continuing operations:
Basic (in dollars per share)	$ 0.09	$ 1.79	$ 1.94
Diluted (in dollars per share)	0.09	1.75	1.90
Earnings per common share:
Basic (in dollars per share)	1.11	2.03	1.97
Diluted (in dollars per share)	$ 1.08	$ 1.99	$ 1.93