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Inventories
6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Inventories InventoriesInventories consist of the following:
June 30,December 31,
($ in thousands)20222021
Proppants$22,948 $23,413 
Chemicals24,660 17,996 
Maintenance parts116,044 93,184 
$163,652 $134,593 
The Company did not record any write-down to the inventory carrying value during the three and six months ended June 30, 2022 or the year ended December 31, 2021.