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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following:
March 31,December 31,
($ in thousands)20202019
Proppants$11,771  $14,013  
Chemicals7,900  10,076  
Maintenance parts67,945  64,458  
$87,616  $88,547