Property, Plant and Equipment

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

NOTE 6 — PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following:

(in thousands)	September 30, 2018			December 31, 2017
Land	$	13,623		$	13,557
Buildings and improvements		104,026			99,233
Machinery, equipment and other		501,148			446,261
		618,797			559,051
Accumulated depreciation		(382,730	)		(347,219	)
Property, plant and equipment, net	$	236,067		$	211,832

During the nine months ended September 30, 2018, we transferred $42.5 million of inventory to property, plant and equipment related to certain assets entering our lease program.

6. Property, Plant and Equipment, net

The components of property, plant and equipment, net were as follows:

	December 31, 2017			December 31, 2016
Land	$	13,557		$	14,636
Buildings and improvements		99,233			91,927
Machinery, equipment and other		446,261			396,505
Property, plant and equipment, gross		559,051			503,068
Total accumulated depreciation		(347,219	)		(301,321	)
Property, plant and equipment, net	$	211,832		$	201,747

Total depreciation expense was $58,178, $56,068 and $60,831 for the years ended December 31, 2017, 2016 and 2015, respectively.