Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Note 7—Property, Plant and Equipment

Major classes of property, plant and equipment consist of the following (in thousands):

	December 31,
	2017			2016
Land	$	79,330		$	76,437
Buildings and equipment	433,977			412,999
Other	15,931			10,431
Total property, plant and equipment	529,238			499,867
Proved oil and gas properties	400			1,122
Less accumulated depreciation and depletion	(79,622		)	(49,727		)
Property, plant and equipment, net	$	450,016		$	451,262

Depreciation expense was approximately $31.8 million, $23.1 million, and $15.3 million for the years ended December 31, 2017, 2016, and 2015, respectively.