7. ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 52,296	$ 46,855
Accrued expenses	32,950	28,809
Accrued payroll and vacation	17,692	11,937
Accrued professional fees	10,875	10,215
Accounts payable and accrued expenses	$ 113,813	$ 97,816