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COMMITMENTS AND CONTINGENCIES - Leases Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Area of leased facility (in sqft) | ft² 97,500    
Rent expense $ 11,900 $ 5,900 $ 4,500
Years ending December 31,      
2019 10,705    
2020 8,384    
2021 7,455    
2022 5,691    
2023 5,430    
Thereafter 19,818    
Operating lease, future minimum payments $ 57,483