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Property, Plant and Equipment Disclosure (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
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