REINSURANCE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Premiums written
Net premiums written	$ 152,151	$ 139,024	$ 295,075	$ 274,429
Premiums earned
Net premiums earned	144,605	133,952	283,336	267,032
Losses and settlement expenses incurred
Net losses and settlement expenses incurred	102,133	105,846	177,918	194,815
Affiliated Entity [Member]
Premiums written
Assumed	125,416	118,286	238,561	225,334
Ceded	(94,752)	(93,161)	(186,480)	(186,062)
Premiums earned
Assumed	116,141	109,397	228,902	215,278
Ceded	(94,231)	(95,596)	(187,051)	(189,531)
Losses and settlement expenses incurred
Assumed	83,828	87,576	139,969	156,039
Ceded	(60,298)	(75,395)	(95,842)	(123,386)
Non Affiliated Entity [Member]
Premiums written
Direct	92,027	90,851	180,787	180,892
Assumed	36,037	33,499	74,985	73,800
Ceded	(6,577)	(10,451)	(12,778)	(19,535)
Premiums earned
Direct	91,506	93,286	181,358	184,361
Assumed	38,383	37,586	75,287	77,380
Ceded	(7,194)	(10,721)	(15,160)	(20,456)
Losses and settlement expenses incurred
Direct	60,186	75,417	95,623	123,427
Assumed	21,141	28,067	42,587	53,069
Ceded	$ (2,724)	$ (9,819)	$ (4,419)	$ (14,334)
Property and casualty insurance [Member]
Reinsurance Transactions For Insurance Companies, by Product Segment [Line Items]
Percentage of pool participation (in hundredths)	30.00%	30.00%	30.00%	30.00%
Premiums written
Net premiums written	$ 120,811	$ 112,464	$ 229,607	$ 214,977
Premiums earned
Net premiums earned	111,254	103,517	219,459	204,764
Losses and settlement expenses incurred
Net losses and settlement expenses incurred	82,817	80,787	139,492	148,513
Property and casualty insurance [Member] | Affiliated Entity [Member]
Premiums written
Assumed	125,416	118,286	238,561	225,334
Ceded	(92,027)	(90,851)	(180,787)	(180,892)
Premiums earned
Assumed	116,141	109,397	228,902	215,278
Ceded	(91,506)	(93,286)	(181,358)	(184,361)
Losses and settlement expenses incurred
Assumed	83,602	87,330	139,500	155,502
Ceded	(60,186)	(75,417)	(95,623)	(123,427)
Property and casualty insurance [Member] | Non Affiliated Entity [Member]
Premiums written
Direct	92,027	90,851	180,787	180,892
Assumed	1,147	993	2,118	1,780
Ceded	(5,752)	(6,815)	(11,072)	(12,137)
Premiums earned
Direct	91,506	93,286	181,358	184,361
Assumed	1,059	891	2,092	1,735
Ceded	(5,946)	(6,771)	(11,535)	(12,249)
Losses and settlement expenses incurred
Direct	60,186	75,417	95,623	123,427
Assumed	677	484	1,223	1,086
Ceded	(1,462)	(7,027)	(1,231)	(8,075)
Reinsurance [Member]
Premiums written
Net premiums written	31,340	26,560	65,468	59,452
Premiums earned
Net premiums earned	33,351	30,435	63,877	62,268
Losses and settlement expenses incurred
Net losses and settlement expenses incurred	19,316	25,059	38,426	46,302
Reinsurance [Member] | Affiliated Entity [Member]
Premiums written
Assumed	0	0	0	0
Ceded	(2,725)	(2,310)	(5,693)	(5,170)
Premiums earned
Assumed	0	0	0	0
Ceded	(2,725)	(2,310)	(5,693)	(5,170)
Losses and settlement expenses incurred
Assumed	226	246	469	537
Ceded	(112)	22	(219)	41
Reinsurance [Member] | Non Affiliated Entity [Member]
Premiums written
Direct	0	0	0	0
Assumed	34,890	32,506	72,867	72,020
Ceded	(825)	(3,636)	(1,706)	(7,398)
Premiums earned
Direct	0	0	0	0
Assumed	37,324	36,695	73,195	75,645
Ceded	(1,248)	(3,950)	(3,625)	(8,207)
Losses and settlement expenses incurred
Direct	0	0	0	0
Assumed	20,464	27,583	41,364	51,983
Ceded	$ (1,262)	$ (2,792)	$ (3,188)	$ (6,259)