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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 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)June 30,
2021		December 31,
2020		June 30,
2020
Land$39,884 $40,222 $40,188 
Land improvements and leasehold improvements97,454 96,700 96,028 
Buildings and storage facilities386,832 387,992 377,652 
Machinery and equipment948,517 925,074 881,144 
Construction in progress19,987 19,725 35,982 
1,492,674 1,469,713 1,430,994 
Less: accumulated depreciation 650,912 590,534 524,977 
Property, plant and equipment, net$841,762 $879,179 $906,017 

Depreciation expense on property, plant and equipment was $64.2 million and $62.3 million for the six months ended June 30, 2021 and 2020, respectively. Additionally, depreciation expense on property, plant and equipment was $32.3 million and $31.2 million for the three months ended June 30, 2021 and 2020, respectively.
Rail Assets
The components of Rail assets leased to others are as follows:
(in thousands)June 30,
2021		December 31,
2020		June 30,
2020
Rail assets leased to others$735,255 $750,473 $742,107 
Less: accumulated depreciation160,670 158,527 149,286 
Rail assets, net$574,585 $591,946 $592,821 

Depreciation expense on Rail assets leased to others amounted to $15.3 million and $15.4 million for the six months ended June 30, 2021 and 2020, respectively. Additionally, depreciation expense on Rail assets leased to others amounted to $7.6 million and $7.7 million for the three months ended June 30, 2021 and 2020, respectively.