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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Components of Property, Plant and Equipment

The components of property, plant and equipment are as follows:
 
December 31,
(in thousands)
2019
 
2018
Land
$
40,442

 
$
29,739

Land improvements and leasehold improvements
103,148

 
68,826

Buildings and storage facilities
373,961

 
284,998

Machinery and equipment
835,156

 
393,640

Construction in progress
59,993

 
102,394

 
1,412,700

 
879,597

Less: accumulated depreciation
474,282

 
402,886

 
$
938,418

 
$
476,711


Components of Railcar Assets Leased to Others
The components of the Rail Group assets leased to others are as follows:
 
December 31,
(in thousands)
2019
 
2018
Rail Group assets leased to others
$
723,004

 
$
640,349

Less: accumulated depreciation
138,706

 
118,564

 
$
584,298

 
$
521,785