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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Summary of costs for property, plant, and equipment
A summary of costs and accumulated depreciation for property, plant and equipment is as follows:

 
June 30,
2015
 
December 31,
2014
 
 
 
 
 
(in thousands)
Land and improvements
$
5,441

 
$
5,263

Buildings and improvements
2,830

 
2,266

Machinery and equipment
560,599

 
559,210

Automotive equipment
448

 
497

Furniture and fixtures
913

 
882

Railcars
14,850

 
14,524

Construction in progress
10,678

 
6,515

 
$
595,759

 
$
589,157

Less: Accumulated depreciation
197,931

 
184,223

Total property, plant and equipment, net
$
397,828

 
$
404,934