DEBT (Details Narrative) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) item	Oct. 31, 2012 USD ($)
Unsecured Line of Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit maximum borrowing capacity		$ 175,000
Number of anniversaries for optional annual extensions of the credit agreement | item	3
Period of extension	1 year
Number of options available for calculating variable interest rate | item	2
Line of credit amount outstanding	$ 0
Letter of Credit [Member]
Short-term Debt [Line Items]
Line of credit maximum borrowing capacity		75,000
Letter of credit amount maintained	31,400
Swingline Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit maximum borrowing capacity		$ 25,000
Line of credit amount outstanding	$ 0