LIABILITY FOR LOSSES AND SETTLEMENT EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of beginning and ending reserves for losses and settlement expenses [Roll Forward]
Gross reserves at beginning of year	$ 661,309	$ 610,181	$ 583,097
Re-valuation due to foreign currency exchange rates	(2,061)	333	(2)
Less ceded reserves at beginning of year	28,253	30,118	31,390
Net reserves at beginning of year	635,117	579,730	551,709
Incurred losses and settlement expenses related to:
Current year	405,850	406,266	346,072
Prior years	(35,114)	(20,792)	(12,785)
Total incurred losses and settlement expenses	370,736	385,474	333,287
Paid losses and settlement expenses related to:
Current year	154,958	162,905	137,998
Prior years	193,123	167,182	167,268
Total paid losses and settlement expenses	348,081	330,087	305,266
Net reserves at end of year	657,772	635,117	579,730
Plus ceded reserves at end of year	23,477	28,253	30,118
Re-valuation due to foreign currency exchange rates	(2,475)	(2,061)	333
Gross reserves at end of year	678,774	661,309	610,181
Summary of approximation of the implied favorable development and its impact on earnings [Abstract]
Adjustment for (adverse) favorable development included in the reported development amount that had no impact on earnings	(618)	2,151	6,526
Approximation of the implied amount of favorable development that had an impact on earnings	(35,732)	(18,641)	(6,259)
Property and casualty insurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (13,800)	$ (8,100)	$ (7,300)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(3.00%)	(1.90%)	(1.80%)
Summary of approximation of the implied favorable development and its impact on earnings [Abstract]
Adjustment for (adverse) favorable development included in the reported development amount that had no impact on earnings	$ 423	$ 2,200	$ 6,500
Reinsurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (21,300)	$ (12,700)	$ (5,500)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(10.80%)	(6.90%)	(3.20%)
Summary of approximation of the implied favorable development and its impact on earnings [Abstract]
Adjustment for (adverse) favorable development included in the reported development amount that had no impact on earnings	$ (1,000)