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Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2020
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)September 30,
2020		December 31,
2019		September 30,
2019
Land$40,223 $40,442 $39,393 
Land improvements and leasehold improvements96,290 103,148 95,720 
Buildings and storage facilities384,203 373,961 354,625 
Machinery and equipment906,864 835,156 608,831 
Construction in progress21,657 59,993 54,163 
1,449,237 1,412,700 1,152,732 
Less: accumulated depreciation 560,726 474,282 449,336 
Property, plant and equipment, net$888,511 $938,418 $703,396 

Depreciation expense on property, plant and equipment was $93.8 million and $51.0 million for the nine months ended September 30, 2020 and 2019, respectively. Additionally, depreciation expense on property, plant and equipment was $31.6 million and $18.3 million for the three months ended September 30, 2020 and 2019, respectively. The large increase in depreciation expense from the prior year was due to the TAMH merger that took place in the fourth quarter of 2019 and ELEMENT being operational for all of the current year.
In the second quarter of 2019, the Company recorded a $3.1 million impairment related to its remaining Tennessee facilities in the Trade group. The Company wrote down the assets to the extent their carrying values exceeded their fair value. The Company classified the significant assumptions used to determine the fair value of the impaired assets as Level 3 inputs in the fair value hierarchy.
Rail Group Assets
The components of Rail Group assets leased to others are as follows:
(in thousands)September 30,
2020		December 31,
2019		September 30,
2019
Rail Group assets leased to others$741,080 $723,004 $699,972 
Less: accumulated depreciation153,229 138,706 134,226 
Rail Group assets, net$587,851 $584,298 $565,746 

Depreciation expense on Rail Group assets leased to others amounted to $23.1 million and $21.1 million for the nine months ended September 30, 2020 and 2019, respectively. Additionally, depreciation expense on Rail Group assets leased to others amounted to $7.7 million and $7.4 million for the three months ended September 30, 2020 and 2019, respectively.