ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accounts payable	$ 30,065	$ 15,682
Accrued expenses - general	31,208	27,268
Accrued salaries and benefits	33,153	41,363
Income taxes payable	1,981	87
Total	$ 96,407	$ 84,400