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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consist of the following:
March 31,December 31,
($ in thousands)20212020
Proppants$15,178 $13,658 
Chemicals15,660 16,434 
Maintenance parts and other98,500 88,476 
$129,338 $118,568 
The Company did not record any write-down to the inventory carrying value during the three months ended March 31, 2021. As of March 31, 2020, the lower of cost or net realizable value analysis resulted in the Company recording a write-down to inventory carrying values of $0.7 million, included as a component in cost of services in the unaudited condensed consolidated statement of operations for the three months ended March 31, 2020.