COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Right-of-use assets	$ 124,369	$ 126,444
Additional amount to be recognized at lease commencement for the lease liability	127,000	126,600
Operating lease liabilities, current portion	8,663	7,891
Operating lease liabilities, less current portion	$ 118,333	118,665
Weighted average discount rate	6.78%
Weighted average lease term remaining on lease liabilities	9 years 6 months
Amount funded towards construction costs		$ 11,300