LIABILITY FOR LOSSES AND SETTELEMT EXPENSES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of beginning and ending reserves for losses and settlement expenses [Roll Forward]
Gross reserves at beginning of year	$ 732,612	$ 690,532
Re-valuation due to foreign currency exchange rates	525	(1,913)
Less ceded reserves at beginning of year	30,923	20,664
Net reserves at beginning of year	701,164	671,781
Incurred losses and settlement expenses related to:
Current year	235,806	216,710
Prior years	(6,087)	(13,197)
Total incurred losses and settlement expenses	229,719	203,513
Paid losses and settlement expenses related to:
Current year	65,714	66,662
Prior years	139,625	119,270
Total paid losses and settlement expenses	205,339	185,932
Net reserves at end of period	725,544	689,362
Plus ceded reserves at end of period	31,148	20,430
Re-valuation due to foreign currency exchange rates	177	(301)
Gross reserves at end of period	756,869	709,491
Property and casualty insurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (5,300)	$ (9,300)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(1.10%)	(1.90%)
Reinsurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (801)	$ (3,900)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(0.30%)	(1.90%)