INDEBTEDNESS (Schedule of Credit Agreement) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility	$ 71,000	$ 86,000
Less: deferred financing costs, net of accumulated amortization of $1,568 and $1,487	(1,078)	(1,240)
Total borrowed	69,922	84,760
Line of Credit Facility, Remaining Borrowing Capacity	179,000	164,000
Accumulated Amortization, Deferred Finance Costs	$ 1,649	$ 1,487
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest margin	2.00%	2.00%
Actual interest rates	3.25%	2.81%