LIABILITY FOR LOSSES AND SETTELEMT EXPENSES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of beginning and ending reserves for losses and settlement expenses [Roll Forward]
Gross reserves at beginning of year	$ 777,190	$ 732,612
Re-valuation due to foreign currency exchange rates	(593)	525
Less ceded reserves at beginning of year	36,595	30,923
Net reserves at beginning of year	741,188	701,164
Incurred losses and settlement expenses related to:
Current year	243,103	235,806
Prior years	(15,617)	(6,087)
Total incurred losses and settlement expenses	227,486	229,719
Paid losses and settlement expenses related to:
Current year	68,394	65,714
Prior years	135,560	139,625
Total paid losses and settlement expenses	203,954	205,339
Net reserves at end of period	764,720	725,544
Plus ceded reserves at end of period	34,642	31,148
Re-valuation due to foreign currency exchange rates	(656)	177
Gross reserves at end of period	798,706	756,869
Property and casualty insurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (14,600)	$ (5,300)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(2.70%)	(1.10%)
Reinsurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (1,042)	$ (800)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(0.40%)	(0.30%)