Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

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

(in thousands)	September 30, 2015		December 31, 2014		September 30, 2014
Land	$	30,285	$	23,380	$	22,415
Land improvements and leasehold improvements	76,414		71,817		68,976
Buildings and storage facilities	301,125		275,059		238,664
Machinery and equipment	368,338		333,559		320,648
Software	70,781		55,436		55,791
Construction in progress	21,044		29,620		28,260
	867,987		788,871		734,754
Less: accumulated depreciation and amortization	372,942		335,264		332,954
	$	495,045	$	453,607	$	401,800

Components of railcar assets leased to others

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

(in thousands)	September 30, 2015		December 31, 2014		September 30, 2014
Rail Group assets leased to others	$	441,267	$	384,958	$	330,318
Less: accumulated depreciation	94,167		87,211		84,469
	$	347,100	$	297,747	$	245,849