Inventory	12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventory	Inventory Current inventory at December 31, 2017 and December 31, 2016, of $4.4 million and $5.4 million, respectively, consisted primarily of spare parts and small equipment held for use in the ordinary course of business. Non-current inventory at December 31, 2017 and December 31, 2016 totaled $4.9 million and $4.0 million, respectively, and 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.

Inventory

12 Months Ended

Dec. 31, 2017

Current inventory at December 31, 2017 and December 31, 2016, of $4.4 million and $5.4 million, respectively, consisted primarily of spare parts and small equipment held for use in the ordinary course of business.

Non-current inventory at December 31, 2017 and December 31, 2016 totaled $4.9 million and $4.0 million, respectively, and 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.