Property, Plant and Equipment, Net

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, Net

PROPERTY, PLANT AND EQUIPMENT, NET

Table 5: Details of Property, Plant and Equipment, Net
	September 30, 2018			December 31, 2017
	(in thousands)
Land	$	13,187		$	13,187
Buildings	115,422			114,051
Plant machinery	284,151			281,786
Mobile equipment	12,828			10,366
Construction in progress	32,186			20,291
Property, plant and equipment, at cost	457,774			439,681
Accumulated depreciation	(167,104		)	(145,678		)
Property, plant and equipment, net	$	290,670		$	294,003

Depreciation expense was $9.1 million and $25.4 million for the three and nine months ended September 30, 2018, respectively, compared to $9.0 million and $26.5 million for the three and nine months ended September 30, 2017, respectively.