Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2016

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

The components of property, plant and equipment are as follows:

(in thousands)	June 30, 2016		December 31, 2015		June 30, 2015
Land	$	28,472	$	29,928	$	29,902
Land improvements and leasehold improvements	77,849		77,191		75,822
Buildings and storage facilities	290,528		303,482		296,035
Machinery and equipment	374,107		375,028		356,759
Construction in progress	51,672		32,871		21,803
	822,628		818,500		780,321
Less: accumulated depreciation	375,361		363,240		343,247
	$	447,267	$	455,260	$	437,074

Components of railcar assets leased to others

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

(in thousands)	June 30, 2016		December 31, 2015		June 30, 2015
Rail Group assets leased to others	$	442,239	$	434,051	$	422,810
Less: accumulated depreciation	102,103		95,940		91,978
	$	340,136	$	338,111	$	330,832