ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ACCRUED EXPENSES [Abstract]
Accrued compensation and benefits	$ 6,664	$ 6,151
Accrued rent and real estate taxes	2,917	2,012
Other accrued expenses	3,234	3,046
Accrued expenses	$ 12,815	$ 11,209