Property, Plant and Equipment

3 Months Ended

Mar. 31, 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)	March 31, 2020		December 31, 2019		March 31, 2019
Land	$	40,336	$	40,442	$	39,552
Land improvements and leasehold improvements	95,327		103,148		82,681
Buildings and storage facilities	381,258		373,961		337,631
Machinery and equipment	861,812		835,156		481,454
Construction in progress	41,824		59,993		151,895
	1,420,557		1,412,700		1,093,213
Less: accumulated depreciation	498,972		474,282		421,408
Property, plant and equipment, net	$	921,585	$	938,418	$	671,805

Depreciation expense on property, plant and equipment was $31.0 million and $17.9 million for the three months ended March 31, 2020 and 2019, respectively.

Rail Group Assets

The components of Rail Group assets leased to others are as follows:

(in thousands)	March 31, 2020		December 31, 2019		March 31, 2019
Rail Group assets leased to others	$	740,809	$	723,004	$	660,747
Less: accumulated depreciation	143,740		138,706		123,118
Rail Group assets, net	$	597,069	$	584,298	$	537,629

Depreciation expense on Rail Group assets leased to others amounted to $7.7 million and $6.7 million for the three months ended March 31, 2020 and 2019, respectively.