LIABILITY FOR LOSSES AND SETTELEMT EXPENSES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of beginning and ending reserves for losses and settlement expenses [Roll Forward]
Gross reserves at beginning of year	$ 690,532	$ 678,774
Re-evaluation due to foreign currency exchange rates	(1,913)	(2,475)
Less ceded reserves at beginning of year	20,664	23,477
Net reserves at beginning of year	671,781	657,772
Incurred losses and settlement expenses related to:
Current year	111,189	92,861
Prior years	(14,904)	(7,752)
Total incurred losses and settlement expenses	96,285	85,109
Paid losses and settlement expenses related to:
Current year	22,923	18,536
Prior years	69,826	61,418
Total paid losses and settlement expenses	92,749	79,954
Net reserves at end of period	675,317	662,927
Plus ceded reserves at end of period	20,788	20,802
Re-evaluation due to foreign currency exchange rates	(976)	(2,150)
Gross reserves at end of period	695,129	681,579
Property and casualty insurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (8,500)	$ (3,800)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(1.70%)	(0.80%)
Reinsurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (6,400)	$ (4,000)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(3.20%)	(2.00%)