Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

The components of Property, plant and equipment, net are as follows:

(in thousands)	June 30, 2018		December 31, 2017		June 30, 2017
Land	$	29,579	$	22,388	$	23,566
Land improvements and leasehold improvements	68,384		69,127		71,236
Buildings and storage facilities	280,226		284,820		298,077
Machinery and equipment	377,202		373,127		382,321
Construction in progress	37,456		7,502		7,372
	792,847		756,964		782,572
Less: accumulated depreciation	384,272		372,287		359,530
	$	408,575	$	384,677	$	423,042

Components of railcar assets leased to others

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

(in thousands)	June 30, 2018		December 31, 2017		June 30, 2017
Rail Group assets leased to others	$	564,555	$	531,391	$	482,524
Less: accumulated depreciation	106,131		107,948		107,432
	$	458,424	$	423,443	$	375,092