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Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The components of Property, plant and equipment, net are as follows:
(in thousands)March 31,
2021		December 31,
2020		March 31,
2020
Land$39,874 $40,222 $40,336 
Land improvements and leasehold improvements96,901 96,700 95,327 
Buildings and storage facilities388,075 387,992 381,258 
Machinery and equipment939,123 925,074 861,812 
Construction in progress16,396 19,725 41,824 
1,480,369 1,469,713 1,420,557 
Less: accumulated depreciation 622,100 590,534 498,972 
Property, plant and equipment, net$858,269 $879,179 $921,585 

Depreciation expense on property, plant and equipment was $32.0 million and $31.0 million for the three months ended March 31, 2021 and 2020, respectively.
Rail Assets
The components of Rail assets leased to others are as follows:
(in thousands)March 31,
2021		December 31,
2020		March 31,
2020
Rail assets leased to others$737,862 $750,473 $740,809 
Less: accumulated depreciation157,263 158,527 143,740 
Rail assets, net$580,599 $591,946 $597,069 
Depreciation expense on Rail assets leased to others amounted to $7.7 million for both the three months ended March 31, 2021 and 2020, respectively.