LIABILITY FOR LOSSES AND SETTELEMT EXPENSES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 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	118,259	116,204
Prior years	(13,290)	(5,576)
Total incurred losses and settlement expenses	104,969	110,628
Paid losses and settlement expenses related to:
Current year	23,608	24,262
Prior years	76,412	81,877
Total paid losses and settlement expenses	100,020	106,139
Net reserves at end of period	746,137	705,653
Plus ceded reserves at end of period	34,927	30,549
Re-valuation due to foreign currency exchange rates	(671)	853
Gross reserves at end of period	780,393	737,055
Property and casualty insurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (9,600)	$ (2,100)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(1.80%)	(0.40%)
Reinsurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (3,648)	$ (3,400)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(1.50%)	(1.50%)