Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013		December 31, 2012		June 30, 2012
Land	$	22,637	$	22,258	$	19,505
Land improvements and leasehold improvements	65,625		63,013		52,536
Buildings and storage facilities	224,281		214,919		172,354
Machinery and equipment	295,723		287,896		243,216
Software	13,469		12,901		11,204
Construction in progress	44,146		34,965		33,613
	665,881		635,952		532,428
Less accumulated depreciation and amortization	294,165		277,074		266,153
	$	371,716	$	358,878	$	266,275

Components of railcar assets leased to others

The components of Railcar assets leased to others are as follows:

(in thousands)	June 30, 2013		December 31, 2012		June 30, 2012
Railcar assets leased to others	$	321,269	$	310,614	$	332,997
Less accumulated depreciation	78,382		82,284		80,032
	$	242,887	$	228,330	$	252,965