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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following:
June 30,December 31,
($ in thousands)20202019
Proppants$7,226  $14,013  
Chemicals5,769  10,076  
Maintenance parts68,172  64,458  
$81,167  $88,547