LIABILITY FOR LOSSES AND SETTELEMT EXPENSES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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	216,710	203,800
Prior years	(13,197)	(15,871)
Total incurred losses and settlement expenses	203,513	187,929
Paid losses and settlement expenses related to:
Current year	66,662	57,389
Prior years	119,270	118,287
Total paid losses and settlement expenses	185,932	175,676
Net reserves at end of period	689,362	670,025
Plus ceded reserves at end of period	20,430	22,409
Re-evaluation due to foreign currency exchange rates	(301)	(1,596)
Gross reserves at end of period	709,491	690,838
Property and casualty insurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (9,300)	$ (9,800)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(1.90%)	(2.00%)
Reinsurance [Member]
Incurred losses and settlement expenses related to:
Prior years	$ (3,900)	$ (6,100)
Percentage change in loss and settlement expense reserves for prior accident years (in hundredths)	(1.90%)	(3.10%)