SEGMENT INFORMATION (Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net premiums earned									$ 754,846	$ 694,994	$ 586,783
Investment income, net of investment expenses									112,799	111,905	109,494
Net realized investment gains									8,695	5,453	6,440
Other income									702	891	2,291
Total revenues	228,994	223,024	219,719	205,305	213,317	206,581	199,646	193,699	877,042	813,243	705,008
Benefits, losses and expenses									775,140	767,169	717,723
Income (loss) before income taxes	37,339	14,395	20,318	29,850	(7,999)	10,020	19,177	24,876	101,902	46,074	(12,715)
Income tax expense (benefit)									25,762	5,862	(12,726)
Net income (loss)	26,526	11,725	15,496	22,393	(2,418)	8,730	14,716	19,184	76,140	40,212	11
TOTAL ASSETS	3,720,672				3,694,653				3,720,672	3,694,653	3,618,924
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Total revenues									746,872	673,282	573,957
Income (loss) before income taxes									88,719	36,081	(24,230)
Income tax expense (benefit)									21,263	2,569	(16,591)
Net income (loss)									67,456	33,512	(7,639)
TOTAL ASSETS	1,995,069				1,905,315				1,995,069	1,905,315	1,865,147
Life Insurance [Member]
Segment Reporting Information [Line Items]
Total revenues									130,170	139,961	131,051
Income (loss) before income taxes									13,183	9,993	11,515
Income tax expense (benefit)									4,499	3,293	3,865
Net income (loss)									8,684	6,700	7,650
TOTAL ASSETS	1,725,603				1,789,338				1,725,603	1,789,338	1,753,777
Operating Segments [Member] | Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums earned									694,192	629,411	533,771
Investment income, net of investment expenses									46,279	40,305	35,690
Net realized investment gains									6,260	3,896	3,066
Other income									88	316	1,592
Total revenues									746,819	673,928	574,119
Benefits, losses and expenses									658,645	637,648	598,684
Total net income (loss) before eliminations									88,174	36,280	(24,565)
TOTAL ASSETS	2,218,464				2,149,356				2,218,464	2,149,356	2,117,352
Operating Segments [Member] | Life Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums earned									61,146	66,031	53,379
Investment income, net of investment expenses									66,467	70,026	73,977
Net realized investment gains									2,434	3,777	3,647
Other income									614	575	699
Total revenues									130,661	140,409	131,702
Benefits, losses and expenses									117,159	130,135	119,712
Total net income (loss) before eliminations									13,502	10,274	11,990
Intersegment Elimination [Member] | Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Total revenues									53	(646)	(162)
Intersegment eliminations									545	(199)	335
TOTAL ASSETS	(223,395)				(244,041)				(223,395)	(244,041)	(252,205)
Intersegment Elimination [Member] | Life Insurance [Member]
Segment Reporting Information [Line Items]
Total revenues									(491)	(448)	(651)
Intersegment eliminations									$ (319)	$ (281)	$ (475)