Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment

Property, Plant and Equipment

NOTE 6. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment include the following (in millions):

	Estimated
	Useful Life	December 31,		December 31,
	(years)	2017		2016
Machinery and equipment	5 - 30	$	3.7	$	3.0
Vehicles	3 - 5		2.6		0.2
Mechanical refrigeration units	30		17.1		16.0
NGL storage tanks	15		4.3		4.3
Workover rigs	5 - 20		174.9		73.8
Other property, plant and equipment	3 - 30		12.0		13.8
Property, plant and equipment			214.6		111.1
Less: accumulated depreciation			(25.4)		(8.7)
Property, plant and equipment, net		$	189.2	$	102.4

Depreciation expense was $17.2 million, $6.5 million and $2.1 million for the years ended December 31, 2017, 2016, and 2015, respectively.