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Property, Plant & Equipment (Tables)
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment [Table]

Property, plant and equipment consisted of the following for the periods specified:
 
June 30, 2018
 
December 31, 2017
Property, plant and equipment
$
161,476,000

 
$
144,849,000

Accumulated depreciation
(79,867,000
)
 
(76,218,000
)
Property, plant and equipment — net
$
81,609,000

 
$
68,631,000