Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 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)	March 31, 2018		December 31, 2017		March 31, 2017
Land	$	29,915	$	22,388	$	29,331
Land improvements and leasehold improvements	69,320		69,127		78,798
Buildings and storage facilities	285,084		284,820		321,344
Machinery and equipment	377,563		373,127		388,230
Construction in progress	15,116		7,502		13,113
	776,998		756,964		830,816
Less: accumulated depreciation	383,235		372,287		390,421
	$	393,763	$	384,677	$	440,395

Components of railcar assets leased to others

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

(in thousands)	March 31, 2018		December 31, 2017		March 31, 2017
Rail Group assets leased to others	$	577,678	$	531,391	$	448,761
Less: accumulated depreciation	115,425		107,948		105,825
	$	462,253	$	423,443	$	342,936