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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]      
Operating lease right-of-use assets $ 167,911   $ 125,947
Additional amount to be recognized at lease commencement for the lease liability 182,200   132,600
Operating lease liability, current 19,220   11,483
Operating lease liability, noncurrent 162,950   121,075
Finance lease, right-of-use asset $ 18,700   18,600
Finance lease, right-of-use asset, statement of financial position, extensible list Other long-term assets, net    
Finance lease liability $ 19,100   18,700
Finance lease liability, current $ 5,900   4,700
Finance lease, liability, current, statement of financial position, extensible list Other current liabilities    
Finance lease liability, noncurrent $ 13,200   $ 14,000
Finance lease, liability, noncurrent, statement of financial position, extensible list Other long-term liabilities    
DOS Rule Investigation      
Lessee, Lease, Description [Line Items]      
Estimated civil damages   $ 48,200  
Loss Contingency Accrual $ 10,000    
Facility in La Jolla, CA      
Lessee, Lease, Description [Line Items]      
Operating lease not yet commenced, asset 22,900    
Operating lease not yet commenced, liability $ 22,900