ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accounts payable	$ 70,071	$ 64,300
Accrued expenses	84,312	83,853
Accrued salary and benefits	58,051	42,003
Accrued professional fees	24,250	17,429
Total	$ 236,684	$ 207,585