INDEBTEDNESS (Schedule of Credit Agreement) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Revolving credit facility	$ 86,000	$ 101,000
Less: deferred financing costs, net of accumulated amortization of $1,487 and $1,163	(1,240)	(1,564)
Total borrowed	84,760	99,436
Line of Credit Facility, Remaining Borrowing Capacity	164,000	149,000
Accumulated Amortization, Deferred Finance Costs	$ 1,487	$ 1,163
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest margin	2.00%	2.00%
Actual interest rates	2.81%	2.25%