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Inventory
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventory
Inventory

Current inventory at March 31, 2019 and December 31, 2018, of $0.9 million and $1.1 million, respectively, consisted primarily of spare parts and small equipment held for use in the ordinary course of business.

Non-current inventory at March 31, 2019 and December 31, 2018 of $7.5 million and $7.6 million, respectively, consisted primarily of spare engine components or items which require longer lead times for sourcing or fabrication for certain of the Company's assets to reduce equipment downtime.