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COMMITMENTS AND CONTINGENCIES (Tables)
6 Months Ended
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Purchase commitments
At June 30, 2019, the Company had the following non-cancelable purchase commitments:
 
(in thousands)
2019 (remainder of the year)
$
145,822

2020
30,001

2021
982

2022
353

Total
$
177,158