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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Accounting Policies [Abstract]            
Operating lease right of use assets $ 37,751 $ 37,751   $ 27,384 $ 0 $ 0
Operating lease liabilities $ 43,171 $ 43,171   $ 30,300 $ 0  
Operating Lease, Weighted Average Discount Rate, Percent 5.795% 5.795%        
Operating Lease, Payments $ 2,500 $ 6,800        
Operating lease expense $ 2,500 $ 6,689 $ 0