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7. ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accounts payable $ 40,952 $ 52,296
Accrued expenses 42,883 32,950
Accrued payroll and vacation 19,119 17,692
Accrued professional fees 8,212 10,875
Accounts payable and accrued expenses $ 111,166 $ 113,813