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COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of purchase commitment, excluding long-term commitment
At December 31, 2019, the Company had the following non-cancelable purchase commitments:
Year Ended December 31,
Purchase Commitments
 
(in thousands)
2020
$
400,260

2021
4,361

2022
2,440

2023
1,750

Total purchase commitments
$
408,811