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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Components of property, plant and equipment
The components of property, plant and equipment are as follows:
 
December 31,
(in thousands)
2013
 
2012
Land
$
21,801

 
$
22,258

Land improvements and leasehold improvements
67,153

 
63,013

Buildings and storage facilities
231,976

 
214,919

Machinery and equipment
308,215

 
287,896

Software
13,351

 
12,901

Construction in progress
48,135

 
34,965

 
690,631

 
635,952

Less: accumulated depreciation and amortization
303,173

 
277,074

 
$
387,458

 
$
358,878

Components of Railcar assets leased to others
The components of Railcar assets leased to others are as follows:
 
 
December 31,
(in thousands)
2013
 
2012
Railcar assets leased to others
$
317,750

 
$
310,614

Less: accumulated depreciation
77,129

 
82,284

 
$
240,621

 
$
228,330