ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ACCRUED EXPENSES
Accrued payroll and vacation	$ 7,741	$ 5,758
Accrued corporate and payroll related taxes	4,657	4,545
Accrued severance and integration	15	1,449
Accrued acquisitions related costs		1,968
Accrued payable to former Alsbridge's owners		4,275
Contingent consideration classified as current	2,365	3,284
Other	6,708	6,692
Accrued liabilities	$ 21,486	$ 27,971