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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment  
Property, Plant and Equipment

3. Property, Plant and Equipment

 

 

 

 

 

 

 

 

 

 

 

December 31

 

 

    

2016

    

2015

 

Land and improvements

 

$
37,479

 

$
32,522

 

Mineral rights

 

 
11,240

 

 

 —

 

Buildings

 

 
90,385

 

 
67,841

 

Machinery, equipment and customer capital

 

 
494,722

 

 
458,975

 

Computer hardware and software

 

 
43,631

 

 
41,850

 

Furniture and vehicles

 

 
10,893

 

 
10,534

 

Construction-in-progress

 

 
30,525

 

 
32,141

 

 

 

 
718,875

 

 
643,863

 

Less accumulated depreciation

 

 
(352,433)

 

 
(332,844)

 

Property, plant and equipment, net

 

$
366,442

 

$
311,019

 

 

Depreciation expense for the years ended December 31, 2016, 2015, and 2014 totaled $36.3 million, $33.7 million, and $28.2 million, respectively.

 

The Company's AROs related to the acquisition of the New Business are for legal obligations associated with the normal operations of the diatomite mining facilities up to the end of the quarries’ exploration.  These AROs consist primarily of costs associated with mine reclamation and landfill closures related to the mineral rights.  As of December 31, 2016, the $1.8 million liability was recorded as a component of accrued pension and other liabilities.