Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Net premiums earned	$ 1,086,972	$ 1,037,451	$ 997,492
Investment income, net of investment expenses	60,414	52,894	51,190
Net realized investment gains (losses) (includes reclassifications for net unrealized gains on available-for-sale securities of ($1,521) in 2019; ($784) in 2018; and $6,390 in 2017 previously included in accumulated other comprehensive income)	53,779	(20,179)	4,055
Total revenues	1,201,165	1,070,166	1,052,737
Benefits, losses and expenses
Losses and loss settlement expenses	830,172	731,611	725,713
Amortization of deferred policy acquisition costs	216,699	206,232	207,746
Other underwriting expenses (includes reclassifications for employee benefit costs of $4,497 in 2019; $6,642 in 2018; and $5,408 in 2017 previously included in accumulated other comprehensive income)	137,415	141,473	103,628
Total benefits, losses and expenses	1,184,286	1,079,316	1,037,087
Income (loss) from continuing operations before income taxes	16,879	(9,150)	15,650
Federal income tax expense (benefit) (includes reclassifications of $1,263 in 2019; $1,559 in 2018; and ($344) in 2017 previously included in accumulated other comprehensive income)	2,059	(11,405)	(29,220)
Net income from continuing operations	14,820	2,255	44,870
Income (loss) from discontinued operations, net of taxes	0	(1,912)	6,153
Gain on sale of discontinued operations, net of taxes	0	27,307	0
Net income	14,820	27,650	51,023
Other comprehensive income (loss)
Change in net unrealized appreciation on investments	70,127	(50,985)	72,251
Change in liability for underfunded employee benefit plans	(20,924)	25,513	(26,122)
Other comprehensive income (loss), before tax and reclassification adjustments	49,203	(25,472)	46,129
Income tax effect	(10,334)	5,349	(17,540)
Other comprehensive income (loss), after tax, before reclassification adjustments	38,869	(20,123)	28,589
Reclassification adjustment for net realized (gains) losses included in income	1,521	784	(6,390)
Reclassification adjustment for employee benefit costs included in expense	4,497	6,642	5,408
Total reclassification adjustments, before tax	6,018	7,426	(982)
Income tax effect	(1,263)	(1,559)	344
Total reclassification adjustments, after tax	4,755	5,867	(638)
Comprehensive income	$ 58,444	$ 13,394	$ 78,974
Weighted average common shares outstanding (in shares)	25,138,039	25,006,211	25,103,720
Earnings per common share from continuing operations:
Basic (in dollars per share)	$ 0.59	$ 0.09	$ 1.79
Diluted (in dollars per share)	0.58	0.09	1.75
Earnings per common share:
Basic (in dollars per share)	0.59	1.11	2.03
Diluted (in dollars per share)	$ 0.58	$ 1.08	$ 1.99